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Re: cleaning the core of silencer
You can use a propane torch and heat it up until it glows red hot. It only takes a few minutes to do the whole tube. Let it cool and then scrub over it with a wire brush. When you're done it'll look brand new
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The premix settings are incorrect, the engine is receiving too much oil in the mixture. You could try a de-coke of the silencer. just remove and clean the baffle. This is only a stop gap until you get the oil/fuel mix correct.
Remove the silencer and clean up the down pipe and silencer ends.
Use a liberal amount of exhaust repair paste and push the silencer back on.
Refit the clamp that holds the pipes together and replace any perished rubberised band that may be used.
Run the motor on idle for about 10 mins to harden the paste and the leave overnight.
Recheck the clamp for tightness and hopefully all should be well with the world, the sun will be shining and you can go for a ride.
Is your carby well fixed? If your air intake is too big ,the bike will not run properly .
Make sure the carby is not taking additional air or not enough .
Clean the air filter , tune the carby with the mixing screw air/fuel
check exhaust bolts and clamps are tight,silencers could be choking up and need decoking,air filter may need cleaning or changing,clean carb float bowls.chech jets are clean,check thottles open together so balanced,clean and regap plugs ,at that millage new plugs wouldnt hurt,
Possibly your powervalve is not operating properly or you have a rich condition happening just off idle caused by your slide needle position or a malfunctioning float valve..
Usually, the only thing wrong with a powervalve is that it's stuck and needs a disassembly and thorough cleaning.
To lean the slide needle, remove the needle and move the circlip up one notch.
If your float valve is malfunctioning, you'll probably notice some trickle of gas out of the overflow tubes when sitting. This will often clear up from the vibration of a running engine, but may have already loaded up the crank chamber. Remove float and valve and clean the needle and seat with a q-tip and carb cleaner. Look for scarification in the seat or a pronounced
ring around the rubber part of the needle. Replace defective parts.
The following possibility for your problems are mention below kindly check
1. Check the Engine Acceleration
2. Clean the plug
3. Check for any blockage in silencer
4. Clean the carbonizer
Kindly rate my help++ Thank you
If the problem is about miss firing,the silencer does not come in.Have you change the spark plug for a new one,have you check the spark plug wire,these aspect must be very consider to solve the problem,check for it.If the problem was fuel ,the engine should completely shut off.Hope that clear your mind and solve the problem.