Saturday, November 15, 2025

Carburettor Replacement

New lungs for the Iron Zebra

Mikuni carbs look less than 10mins to install

Is it true in general motorcycle carburettors becomes less reliable when they are 10yr old and justify replacement?

In general, motorcycle carburetors can remain functional for many years, often lasting the lifetime of the bike if properly maintained and not physically damaged. However, after about 10 years, carburetors tend to become less reliable due to several factors:

Wear and Tear: Over time, internal components like jets, needles, and diaphragms can wear out or degrade, affecting fuel flow and mixture.

Corrosion and Gunk: Exposure to fuel, moisture, and air can cause rust, varnish, and deposits to build up inside the carburetor, leading to clogging and poor performance.

Seals and Gaskets: Rubber seals and gaskets can harden, crack, or leak with age, causing fuel leaks or air leaks that disrupt carburetor function.

Fuel Quality: Modern fuels with ethanol can accelerate deterioration of carburetor parts if the bike is not used regularly.

Because of these issues, many riders choose to rebuild or replace carburetors after around 10 years to restore reliability, improve performance, and avoid problems like hard starting, poor throttle response, or fuel inefficiency. So yes, it is generally true that motorcycle carburetors become less reliable after about 10 years, and replacement or rebuilding is often justified to maintain optimal performance and safety. Comparison: China Sheny Wey PD26JS vs. Japan Mikuni PD26 24Q09 Carburetors for Regal Raptor Bobber 350 China Sheny Wey PD26JS:

A budget-friendly Chinese carburetor commonly found on Regal Raptor Bobber 350.

Offers basic functionality but may have inconsistent manufacturing quality.

Users often report the need for frequent tuning and maintenance.

Durability and reliability can be variable, with some wear issues over time.

Japan Mikuni PD26 24Q09:

A genuine Japanese carburetor known for high-quality engineering and reliability.

Provides smoother throttle response, better fuel atomization, and improved engine performance.

Easier to tune and maintain, with widely available parts and strong aftermarket support.

Offers superior durability and consistent performance compared to the Sheny Wey. Conclusion: Upgrading from the Sheny Wey PD26JS to the Mikuni PD26 25Q09 is generally considered a significant improvement in terms of reliability, performance, and ease of maintenance.

For your Regal Raptor Bobber 350, the Mikuni carburetor is a worthwhile investment to enhance ride quality and long-term dependability. Ref: Aria (Opera) Browser AI chat

Thursday, November 6, 2025

LESSONS FROM LONG HAUL STORAGE

 


After 5 yrs storaged, my trusty 10 yr old Iron Zebra gets fully serviced. However, my mechanic and others confirmed be prepared the need to replace some components as there could be corrosion between metal and engine oil, petrol, coolant, brake oil even rain water. It was an expensive exercise but reliability was assured as new spareparts replaced aging 10 yr components:

1. Tank (rusted) internally anti-rust sealed. 

2. Petcock switch (clogged) replaced.

3. Petrol filter set (clogged) replaced

4. Carburettor serviced and 2 needle valves (corroded) replaced. 

5. Radiator (badly clogged) teplaced

6. Fan motor switch (malfunction due to rain) replaced.

7. Kettle (leak) replaced.

8. Headlight (cracked) replaced.

9. Sidelights (cracked) replaced.

10. Internal throttle (torn) replaced with aluminium version. 

11. Handlebar grips (worn) replaced.

12. Number plates (cracked) replaced with aluminium version.

13. Brake and clutch levers (worn) replaced.

24. Tyres (torn) replaced.

25. Rear brake pad (worn) replaced.

26. Foot pegs (cracked) replaced.

27. Toe pegs (matched to footpegs) replaced. 

28. 3 Oil seals (leak) replaced. 

29. Battery (long expired) replaced.

30. Exhaust pipes (rust) double epoxy sealed then high temperature sprayed matt black.

The Iron Zebra is fundamentally fine. It's just that after 10 yrs, many components aged so wore due to wear and tear. 

Thursday, October 23, 2025

HEADLIGHT REPLACEMENT

 After 10yrs, the clear plastic of the headlight has become so yellow stained even Autosol-ing it as suggested by my mechanic couldn't deliver the brightness of a clear plastic. Upon close inspection, there is a minor crack at the edge of the clear plastic, I still remember, from a flying stone, good enough to cause rain drops to seep in and dull the bulb reflector. The original replacement cost RM180 😵‍💫 so I bought a 3rd party equivalent via eCommerce for RM24 (transportion free). That is 87% cheaper. It has an aluminium case and I choose the chrome plated version, impressed after seeing it on my friend's bobber. It is of basic quality and the photo shows it after being Autosol polished. OK lah. The bracket quality is basic but I believe sturdy enough, well, what do you expect for a budget but functional option? Still, I'll expect the headlight to be very clear and that's the important thing.




PILLION RIDER ACCESSORIES

Ever since I been rejuvenating my bobber to make it road worthy lately, when I told my mechanic wifey is desirous of hitching a ride with me around the local neighbourhood, he laughed and said let her. To him the ride on the solo seat of the hatdtail bobber was hard enough, what more, the pillion rider seat where there is no rear suspension. He said it will most probably be her first and last ride.

 There will be no special custom bracket for my pillion rider seat merely a cushion and suckers onto the rear fender so when she's not coming along I can take it off. I bought the pillion rider footpeg which will be attached to the frame and am thinking of putting it on the lower frame to ease the knee joint. 



Adding water onto rear fender really helps suckers grip rear fender; 

Pillion footpeg in horizontal mode


Sunday, October 19, 2025

FIRST RIDE AFTER HIBERNATION

After 5yr storage under the balcony and a proper service enough to be get a JPJ PG10 certification, my first ride is not cruising around on a joy ride but to pay my respects to my roots because that is where it all started.

Visit to bapak's grave


Visit to mak's grave

Sheng Wey PD26JS Twin Carburetor Tuning

 For 5 yrs I've sent my bobber to have the twin carbs fully serviced by 5 separate motorbike workshops throughout Klang Valley where all were serviced by the senior mechanics yet after a few thousand km of riding, I found there were much carbon built up on the right plug compared to the left plug. From discussions with the President of the Regal Raptor Owners Motor Group, he said it was generally known the right carburettor tends to be slightly rich but no one could offer a solution like it was live and let live. However, this carburettor is internationally popular, used on a variety of motorbikes and reputed as reliable so I felt something must be wrong probably with our Malaysian batch but business being business, no one in the budiness of selling motorbikes is going to admit it.

After a long hiberation, my Iron Zebra was given a thorough service to ensure it gets the JPJ PG10 inspection certification and it did. Still, there was some petrol overflow. My mechanic said it was very difficult to clean the petrol scum that stuck to the wall  he even used an ultrasonic equipment for my carbs. After a second dismantle and critical inspection of the twin carbs, the mechanic said my valve needle were faulty and couldn't be repaired so were replaced. After a few runs, I acknowedged the carburettors now run more smoothly than before in particularly, cruising at <30kmh, specifically, 20kmh. The motorbike does it so smoothly. not once coughs like it used to before. My new mechanic generally services superbikes and is also a racer so I suspect his motor mechanic is very sound filled with much experience.

Mechanic said based on the Mikuni carb needle valve chart, PD26JS  needle valve looks similar to the one he highlighted


Monday, October 13, 2025

JPJ PG10 Inspection

Waiting for senior officer's approval

Insurance agent located at JPJ canteen

 Insurance companies rejected my request to renew my motorcycle insurance as the road tax was not renewed for 5 yrs and said it needs a PUSPAKOM inspection. Having thoroughly serviced the bobber I drove to JPJ Padang Jawa, the nearest branch that handles request for vehicle inspection and asked an officer from the enforcement unit. He adviced me to make my request at an insurance agent located at JPJ canteen and was confident I'll get mine there.

To my query, I was surprised they do offer insurance coverage for PG10 inspection but on a yearly basis. I was also surprised they offered third party coverage with no questions asked. Thus, I immediately renewed my insurance and paid via online banking.

Secondly, I got the Vehicle Inspection Permit approved as my insurance coverage was active then went home to get my bobber.

The inspection was held behind the main building and took less than 10mins. After the officer took photographs for reference, checked the chassis and engine number against the JPJ grant was the same, I was told to wait a short while for the senior officer to endorse the approval. 

Later, the officer assisted me to renew my road tax via my JPJ app. That was all, literally no appointment needed, just walk-in, FOC, just bring along original grant and active insurance coverage.

Monday, September 22, 2025

The history of the Iron Zebra

 


Once upon a time, when I was 8, my family went to the National Zoo which opened in 1963. Although I already understood then the purpose of animal camouflage, standing in front of the zebra, I wondered how it's stripes helped to against but even she could not give a convincing answer.


 My family moved on to the next pen but I was also mesmerized by it's radical beauty. I remembered asking my teacher

At 17, on day, I (rode a Yamaha RX 100) happened to pass by a workshop and saw a hardtail Triumph T100 being serviced. I asked and got permission to sit on it and was so impressed by it's riding position: relax and up-right: no back shoulder fatigue, legs stretched forward: relaxed if riding and feet: firmly planted safely on the ground when stationary, Thus, I confirmed if I ever bought a motorcycle it will definitely be a hardtail bobber. It was only 350 yet this Triumph roared. The owner clarified they are hard to come by, he found his only by chance while searching for car spareparts at a junkyard. I thought if I ever realize it, it will be custom painted with zebra stripes for my fascination of zebra stripes. But dreams only remained dream as the reality of life made it impossible when I started to work: CKD hardtail bobbers were not assembled in Malaysia and an imported version was expensively out of the question.


Decades passed. One night in 2014 after Tarawih prayer I walked home very tired and in the middle of it, raised my arms and asked Allah if possible, get me a motorbike and make it more convenient for me to go to mosque. I didn't know my wish was going to be accepted soon. The week before I pensioned at 60 in 2015, I told to my staff of my intent to buy a Vespa Primavera as it will be convenient to go to mosque but most were against it because they said it didn't suit my charisma and suggested I get at least, a second hand cruiser/sportsbike. So I surfed the internet and suddenly out popped on the screen a Regal Raptor @ Momos Bobber 350 which looked exactly like those I used to see at the back of DC comics when I was young. To my surprise, it was already CKD in Malaysia in 2014 and retailed under RM18,000 within reach because I was to receive a RM20,000 golden handshake in lieu of holiday request rejected in priority of job task accumulated since I first started working.


In 2015, a day after I pensioned, I immediately visited a seller in Shah Alam and behold there she was - a Premium version: all black, standard with fishtail pipes. It was called a factory custom motorbike and was very well built, in fact I found out later the hardtail frame won first prize in the EURO3 hardtail specification. Not bad! There was hardly any further custom work needed. In real life, she looked outstandingly old school product and ozze a rebellious character. The seller was enthusiastic of getting rid of it because for 6 mths, there were no takers. It was the only one there and he offered to absorb the GST 10%tax (RM1,000). I wish but couldn't test ride as the service lane in front of the shop was busy with traffic so I just asked to start the engine. The seller did and I was blown away by the thumpy, loud exhaust note even JPJ approved! He clarified it was due to the long exhaust pipe and fishtail design. We were there less than 10 mins then I stunned him when I confirmed I'd take it and pay by cash. He was more than delighted and interviewed my background as most of his clients usually took a loan. I told hm my golden handshake was enough to cover the on-the-road price. I clarified I had long desired a hardtail bobber so this was a dream come true!


The bobber was to be ready for collection in a week. That gave me enough time to search for an airbrush painter, coincidentally, one was located in my neighbourhood. He was busy yet agreed to do the job but asked me to come up with the artwork as he didn't know how to draw the stripe pattern. I surfed the internet again and used the Burchell zebra as my base, I felt has the most beautiful stripes. I also still remembered at 37, I took my toddler to the zoo but also to visually estimate the average width of a stripe actually its neck. That was holistic planning. This was about 2" at the neck with the widest 3" at the rear so my bobber will reflect that ... one day.


The bobber was sent to the painter's workshop and I gave him the digital artwork requiring him to enlarge and ensure stripes  2" wide to stand out from a distance.The painter fabricated stripe stickers and I was given a free hand to stick them one by one on the bobber according to my specifications. Then I found sticking flat design stickers onto convex base resulted in overlapping stripes at certain areas so I had to alter the design of the stripes live on the motorcycle. That was not too difficult, just needed more time. Later, I left the painter to complete the airbrush job and insisted there must be no hump/ridge between black and white paint plus the clear lacquer job must be showroom quality. The painter said not an issue but he couldn't be rushed. Agreed!


At the same time, I bought a Bell Custom 500 helmet and asked him to spray matching zebra stripes. However, the task of sticking stickers on a helmet's very convex base was too difficult to do. Thus, the black helmet was sprayed white and I drew the stripes free-hand on one side leaving the painter to replicate the other side by inverting stickers based on the side I drew which incidentally went all the way to the sun-shade! I actually wanted asymmetrical stripes as on live zebras but my painter refused fearing it will tarnish his reputation for causing careless error so I accepted symmetrical stripes.


I had a design concept: the area within the triangular frame will be black meaning the false oil tank was left black. Front stripes were designed to pierce the air. Tank stripes were based on a zebra's neck and I wanted at least 5 clear stripes. A unique stripe pattern near the shocks and frame was based on one similar where legs meet zebra abdomen. Other stripes will converge to that unique stripe pattern. The painter asked who I drew on the tank but I told him there were none. He told me look again. It was not until I refocused that I saw the clear image of a spirit of an African warrior with war paint. It was unintentional so I said that's the Spirit of the Iron Zebra, the name I gave tof my bobber. The stripes on the helmet were designed to flow with the wind where I purposely created a central hub at the top to balance out the width of the helmet stripes. Finally the Iron Zebra was born.


A month later, the bobber was vandalised outside a secondary school where the end section had it's central spine cracked and parts of the rear fender scratched 100 times with what looked like a padlock. I had it resprayed, the end section replaced but the rear section was again vandalized when parked by a closeby mosque. It didn't take a fool to suspect the vandalist was a schoolboy from that secondary school. The rear section was a right-off, dismantled, side lights indicators refitted to other points and a side licence plate-cum-brake light holder fitted as I couldn't afford another replacement. The front side light indicators were shifted to a similar level with the rear side lights indicators. The painter smiled, said it now gave the bobber a more rebellious character, looking closer to the classic hardtail bobber. After a while, the exhaust pipe system was painted with black heat resistant paint as showroom scratches were too obvious. The Iron Zebra is now complete and requires no more custom work.


Unlike riders who see their motorcycle merely as a vehicle to ride, I also appreciate my bobber as an industrial arts sculpture so enjoy admiring it under the balcony as I sip my evening tea. I told people the bobber is really a reflection of me so if you want to know more about me, interpret the Iron Zebra.


The only mod done was an upgrade from 0.75mm to 1.0mm spark plug cables and a power cable from engine block to rectifier. That made better response.


I ride with a heavy duty Wild One biker jacket. It was originally sold for RM1500 2 yrs ago before I bought the bobber and being the last unit, the seller offered RM850. I haggled for a cash discount and eventually got it for RM550. He said it was a good buy but suggested I use a leather conditioner as it was very dry. The remainder of my golden handshake went to a pair of leather boots and gloves. Dusty urban air makes me ride with a zebra face mask/balaclava and that adds to the mystique of the Iron Zebra rider.


The Iron Zebra looks is radical and rare as it gets, not custom to impress but to realize a schoolboy's dream that perservered across decades. Truly the Iron Zebra and me are uniquely different ... A one-of-a-kind.

Sunday, September 21, 2025

2025 Restoration works

 My bobber was cold storaged under the balcony since 2020, myself, a scam victim where the Iron Zebra functioned more as an industrial arts sculpture. Life got better beginning this year and she was sent to a workshop to be thoroughly service in anticipation soon for a JPJ PG10 inspection. Externally, she looks the same except for matt black fishtail pipes, matt black alloy case sidelights, chrome alloy footpegs, matt black mirrors, matt black clutch/brake grips, vintage style handlebar grips and a new set of Bridgestone Exedra tyres.

Issues

1. Tank was cleansed and internally anti-rust coated due to much rust residue from long storage..

2. Tank's cock switch was replaced as it was clogged with rust residue due to long storage.

3. 8yr old radiator was replaced as metal-coolant corrosion clogged the fins from long storage then caused a leak.

4. Fan motor switch was replaced as contacts corroded from long storage.

5. Carburettor float needles were replaced as it caused overflow.

6. Old worn stick tyres were replaced though rear tyre's width was reduced from 160 to 130. This help reduce gap between rear fender and tyre.

7. A hazard light switch could not be installed as it requires complex wiring setup often a factory standard.

8. A magnetic drain plug was replaced to the original plug as the poor quality caused leaking.

9. An aluminium internal throttle replaced flimsy stock version

10. A set of alloy case sidelights replaced the stock plastic stock version.

11. The temperature sensor was in good condition as it lighted the temperature diode when the fan didn't activate.

Hard rubber handlebar grips replaced worn alloy chrome version are more compatible to Malaysian climate

Fishtail pipes get high temperature matt black paint to hide harsh showroom scratches

Matt black side mirrors and clutch/brake grips replace worn stock chrome version

Chrome footpegs-cum-support bracket replace crack stock version

130/90*16 tyre is visually more pleasing in height to rear fender than stock 160/80*16 tyre and vintage style alloy case sidelights replace worn stock plastic case version