Q: Hi guys, I know you only seem to answer questions on ‘real’ motorbikes but I was wondering if you could perhaps help me with my poor little Yamaha BWS?
It’s covered just over 12,000km now and it’s completely standard besides a Leo Vince exhaust. I still use the stock air-box and I didn’t, or haven’t, changed the main jet because the plug colour seems to be correct, and it’s done over 8,000km since I fitted the pipe so I’m sure it would have blown up by now if it were running too lean.
Anyway, recently it has no power off the line and seems to take forever to get going. I took off the drive belt cover and then inspected the belt and rollers, all seemed to be in good condition. I cleaned everything nicely before putting it back together and it was a bit better for a few ks until the problem once again returned. I also cleaned out the carb and especially the pilot jet and all seems to be OK in there as well.
So what can you tell me to look for seeing as it’s only a scooter and surely it can’t be that hard to fix? Thanks…
Chris Easter.
A: Take off the drive cover again and take out the primary clutch with the rollers behind it. You’ll then see that this mechanism all slides on a central steel bush with a grease retaining seal on each end.
If this is not properly lubricated with very high temperature grease it will most certainly cause this problem. Guys who race them do this to their bush nearly every race because of the reason you’ve stated.
So try this out and I’m sure your speedy pull-off will return?
