OK.
This is the stuff which puts the forum into full swing. :hihihi:
As many of you know, I am a proud owner of 1967 Bridgestone Mark II RS (2 stroke 200cc twin).
I racked up around 700 miles since the complete rebuild. The last one being a spirited circuit run @ Willow Springs.
I managed to mis-shift (accidentally shifted down due to the reverse pattern from regular motorcycles), lock up the rear tire and crash. That by itself was relatively harmless. Very few scratches + bent shift pedal.
Two weekends ago, I went to the usual nearby twisty.
Then it started happening.
In the first gear, it feels like drive chain is skipping sprocket teeth. Sudden loss of acceleration with horrible noise. I really thought it could be worn sprockets so I put new front sprocket but it still happens.
I guess I have to split the crank case again but am afraid the cause will be not that self-evident.
It appears to occur only under power. I put it on the main stand and let the rear tire spin in the air but no skipping.
Never happened in other gears so far.
I posted this on Bridgestone forum but so far no replies.
So yet again I need great collective knowledge of this forum.
What should I look for when I open up the tranny?
BTW, here's the latest trim.
This is the stuff which puts the forum into full swing. :hihihi:
As many of you know, I am a proud owner of 1967 Bridgestone Mark II RS (2 stroke 200cc twin).
I racked up around 700 miles since the complete rebuild. The last one being a spirited circuit run @ Willow Springs.
I managed to mis-shift (accidentally shifted down due to the reverse pattern from regular motorcycles), lock up the rear tire and crash. That by itself was relatively harmless. Very few scratches + bent shift pedal.
Two weekends ago, I went to the usual nearby twisty.
Then it started happening.
In the first gear, it feels like drive chain is skipping sprocket teeth. Sudden loss of acceleration with horrible noise. I really thought it could be worn sprockets so I put new front sprocket but it still happens.
I guess I have to split the crank case again but am afraid the cause will be not that self-evident.
It appears to occur only under power. I put it on the main stand and let the rear tire spin in the air but no skipping.
Never happened in other gears so far.
I posted this on Bridgestone forum but so far no replies.
So yet again I need great collective knowledge of this forum.
What should I look for when I open up the tranny?
BTW, here's the latest trim.