jinlun125t-13 mis fire??

[grahamplant]

hi
can anyone please please help me
i have a jinlun 125t-13 registered dec 2005 and ive got a problem (big)
as my bike reaches 40 mph the rev limiter starts to come in.
ive rang recol at blackpool and asked him whats going on , he told me its either the drive belt or the clutch. so i checked the drive belt out (good condition) so i bought a new clutch and had it fitted by bennetts of barnsley. in total £142.70p including parts
i still have the same problem !!!
full description of problem -
as you approach 40 - 45 mph the bike starts to try and slow me down , its only doing 6000rpm it is exactly the same as when you get to 50-55 mph and 8000 rpm. theres no problem when the bike is on its stand and goes to 8000rpm, so its only when under load
sometimes you feel a large flat spot 30- 35 mph then it gets going again and goes to 50 mph before cutting in, its blown the rubber breather pipe off the exhuast twice. its had a new plug, oil, and front pads fitted by me ! (thats the next problem)
i would like to know is it carb or electrical as its not drive
front pads- my front pads started to make a loud squeaky / grinding noise then started to bind on. i was told to take the gold sprindg at the back of the pads out . yes the problem has stopped but now they chatter like a pair of false teeth.
what side on the gold spring are the 2 little teeth supposed to be on ??
ive bled the brakes totally with new fluid, reset the piston, then bled again, as soon as i put the spring back in were off agian

can anyone please help me or give me positive advise on which way to go

graham

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[r08813]

I would guess that the breather pipe on the exhaust is telling you the problem.

The breather pipe running from a small metal box on the exhaust to the air box (where the air filter is) is used for emission reasons.

There is a small reed inside the box which fails. The exhaust gases pass straight back into the engine under load and this will cause the bike to slow down or stutter. These reeds fail regularly.

The quickest test is to warm the bike up, put it on it's stand, with the engine running and squeeze the breather pipe closed with your fingers. If the idle speed increases, the reed is the problem.

If this is the case (or you actually want to check the reed visually), you can open (when cold) the little box on the exhaust (2 screws) and see the reed.

You don't really need this reed, the box can be removed and the hole welded in the exhaust, but that is not really a diy job.

The easyest fix is to disconnect the breather pipe, stick a bolt inside it to block the tube and use a jubilee clip to hold it in place and air tight. Put the end of the pipe back on to the reed box on the exhaust, fix it well using a jubilee clip, or it will keep popping off.

Road test the bike and you should notice the difference.

Just for info, this breather is to stop some polution by allowing unburnt fuel back into the engine. It's for emission control and disconnecting it hardly makes a difference.

[grahamplant]

many many thanks

im gonna have a go at it, could you also cut the pipe in 2 bits and block both ends up leaving enough pipe to do it your way if it all goes wrong

all i can say many many many thanks

graham

[grahamplant]

hi
ive done the job its a bit tight under there but finally its fixed and goes better than ever a thousand thank you's. i really cannot thank you enough after all that time effort and money ive spent its a £1.50p job actually free i got all the bits from work for nothing

many thanks

graham