05-28-2021, 10:31 PM
lazz, really sorry to hear about this problem. As others said, there could be many reasons. But you would certainly go from doing ALL the easy/cheap tests, before tackling more difficult/expensive solutions. May be taken the engine apart is the only solution - but it is certainly the last ever considered. Now this said - unless you park her in the dealers yard and he is willing to fix it for you (which I doubt) ... if it was my bike, and after all you did already, I would do the following:
- first ask the dealer to use his connections, and organize a ride on another CB for me, just to be sure (that you can feel the difference),
- you said it's rpm/s not speed, so go to that rpm range in third gear (not higher !), pull the clutch AND keep the throttle open so the rpm doesn't fall off, what happens ? same vibrations, or less, repeat until you are sure;
- it can be rpm/s and NOT be the engine, we need to know for sure, which is very difficult to say at high speed and rpm/s with your hands tortured;
- strap several accelero-meters (best the recording type) to places like fork, engine, tail etc. and get the frequency spectrum read-outs for each to compare. where is the problem located, what is just resonating, resonances, all objectively (your wrists may just be more sensitive than other body parts; have some one who knows these devices check the read-outs for you.
If you don't know how to do this, there may be guys at the race track or (if you are near water) the power boat guys who may be willing to help with this. If not, local mechanics department at the university.
- first ask the dealer to use his connections, and organize a ride on another CB for me, just to be sure (that you can feel the difference),
- you said it's rpm/s not speed, so go to that rpm range in third gear (not higher !), pull the clutch AND keep the throttle open so the rpm doesn't fall off, what happens ? same vibrations, or less, repeat until you are sure;
- it can be rpm/s and NOT be the engine, we need to know for sure, which is very difficult to say at high speed and rpm/s with your hands tortured;
- strap several accelero-meters (best the recording type) to places like fork, engine, tail etc. and get the frequency spectrum read-outs for each to compare. where is the problem located, what is just resonating, resonances, all objectively (your wrists may just be more sensitive than other body parts; have some one who knows these devices check the read-outs for you.
If you don't know how to do this, there may be guys at the race track or (if you are near water) the power boat guys who may be willing to help with this. If not, local mechanics department at the university.