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JTR250 strange behaviour.


strugglinon
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So I've got myself another project bike.

'93 JTR160 with a 250 motor in it as the previous owner couldn't find a 160 piston.

it starts 2nd kick no problems, runs off choke happily. After 5-10 mins or so it's revs begin to pick as if the dry side main seal is passing air.

let it cool down and it's back to normal.

ill do a vacuum test on it this week, but could it be a stator problem?

any suggestions?

graeme

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Ok, I've put a new main seal in on the dry side.

carb has been cleaned in the ultrasonic bath.

can anyone tell me what size the pilot jet should be?

the motor is behaving the same way. Revs begin to rise steadily then level off. A bit of choke settles it down, so it's still running lean.

hmmmmm?

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Well Ive managed to sort it all out.

the gasket between the reed block and intake manifold was letting air in. Took me ages to find because I took the reed block off to seal the motor for a vacuum test.

the gasket in question was a piece of gasket paper, cut out to fit. Replaced it and happy days.

i like this old bike. It rides really nicely.

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