Topic Approved

A small intro about you and your bike shall be appreciated.
There HAS to be a problem with your coil plate. Its prolly too advanced or someone has tried to change the timing. Is it a second hand bike? You can break more kicks ,kick shafts and ankles if dont do anything about it soon. Post some pics.

I am Yunus from surat, its a second had bike i bought & got it restored.
the kick back is too frequent & also the kick slips may times

i had been to my mechanic, got the ide checked but dint found any problem. he also opened left side box to check the coil but he dint found any problem thats what he said. another mechanic said there is problem in your piston, hence it makes more smoke & give less average.

just fyi. i have recently got the cranck fixed while bike was under construction & piston was replaced before 2500 kms before 2 years

You kick is slipping because the kick ratchet is worn off due to the frequent kick backs. I still feel the timing has to be checked. The piston alone does not have to do anything with the bike smoking too much. If possible swap the coil plate from any other RX135 and check.

P.S- what is 'ide'?

the kick back may also be because of a faulty cdi

+1! swap the CDI too.

reply:

Hi yamdoot n kb100. i have swaped the CDI at mechanic shop but this did not resolved the problem hence i returned the same. still the problem remains unresolved, also my RX135 is having carbator of RX100. seek your views

Are you using the stock plate & magnet that came with ur bike?

If Yes, then the problem should be with the timing or the CDI, start with a timing Gun & u'll soon see why it is happening. If timing is spot on, swap a CDI from ur friend's bike or something to get to know if the CDI is faulty.

If ur using a Bigger Generator,
The timing as per the kick back's should be either too advanced or retarded, assuming ur's being a stock 4S the timing should be around 22Deg i guess & can be advanced to further 4deg, so anything above the mark or less than it will cause problems like this...

you need to retard the timing. too much advance will hole the piston or cause rings to melt. 22 degree or even less, check plugs too and post plug electrode pics.
revert back to 4s carb. timing and jetting shuldnt be done at the same time

You mentioned that each part purchased and fixed original. But then you say that you have RX100 carb on your RX135. Why? A critical component like carburetor should not be put from a different bike. Try to install the stock carb for RX135 as soon as possible.

On your timing issues. Are you certain that your coil plate is genuine and of RX135 only? Can you double check this. If you have eliminated the possibility of a faulty CDI, then all suspicion goes to a faulty coil plate.

The magnet is a spinning component. If it is stock (genuine) and not damaged, then this should not be the cause of your problem.

I believe that with a stock generator setup and a stock clean carb (no blocked jets), you should not face any kickback issues.

If all components have been verified, and you are still facing this issue, then you can drill holes on your coil plate to change (advance or retard) your timing. But I wouldn't suggest or recommend this. I would suggest you take your bike to a good Yamaha Service Centre and try to speak to a mechanic who has experience in two-strokes.

Theoretically speaking, timing has an effect on jetting and jetting has an effect on timing. Advancing your timing will lean out your jetting. Retarding your timing will richen your jetting. This is what I have read.

That's the reason I am asking you to ensure that both your coil plate+magnet+CDI setup and your carburetor should be stock and installed and functioning correctly.

Cheers!
Rohit.

I asked my mechanic several times regarding the carbatour to be replaced. & to 2 other mechanics also. all of them they said no its fine and does not much effects the bike. i had purchased this bike in very scrap condition, have not replaced the carbatour since than. regarding the magnet plate & coil plate i need to check with my mechanic weather its geniune & of RX135 . CDI Is original & have changed it before 3 months. even have checked from other bike but dint find any issue with the CDI.

will check with my mechanic regarding the timing,coil plate & magnet..

thanks to all !!

Friend. The first thing we should do once we start participating in two-stroke forums is, to stop trusting and start questioning our mechanics!

Just check this info:
RX100 - Mikuni VM20 carb - 20 pilot jet 115 main jet
RX135 - Mikuni VM22 carb - 17.5 pilot jet 165 main jet

So if you're running an RX100 carb on your RX135, then your bike will run lean in the working range of the main jet. Which is not good for your engine.

Anyways, carburetion is a vast topic.

@ the thread starter, the highlighted is for the 4S and 5S config is different, just to clear the cloud

planning to buy a new carb, stock available in my city is (RX 135 carb 5speed) does this works fine with RX135 4 speed?
pls suggest.