johnw (07/23/82)
Reading the article about the CSR 750 reminds me of a similar problem that I had about a year ago with a KZ750(4) Mod. E2. At about 4000 RPM the CV carbs are right on the verge of crossing between the midrange jets and the high speed jets, this caused an extremely annoying "flat spot", it actually felt like the bike was out fuel, ran fine @3800, or @4200revs. This could be part of your problem. Hopefully not. A good thing to check for your situation is the type of chain that you are using, if it is of the "O-ring" version as most KAW's come with nowdays, immediately suspect it, these units display some degree of lateral tensioning because of the added friction of the O-rings, thus making it harder to straighten out the chain after making it through the sprockets. As is well indicated by chain temperature after riding. Of course by now you probobly have applied some commercial version of "super glue" lubricant to your chain such as "chain kote" or some other high viscosity type oil, unfortunately the compounds used in these lubricants do not really "loosen up" until the chain becomes rather hot, possibly compounding your problem. For starters you should check for broken motor mounts which could cause possible misalignment of the sprockets, then take off the rear wheel and see what type of shape your "cush drive" rubber pucks are in, they should be semi-soft, yet not have any cracks in them. If all else fails then for the cost of ~$40.00 - 100.00 you should be able to solve your problem, start with a TSUBAKI (nothing else) #530 chain, don't bother with another O-ring chain, I have had these chains last over 10000 miles, of which many were put on at a standstill, if this still does not clean things up a bit then head for the big bucks, nylon sprockets, yes they do last, as well as asorb some of the "slack" in the drive chain. If you run out of ideas after this point, try a chain tensioner off of something like a RM 465X dirt bike, about 25.00, works great on my moto bike, with about an inch of chain slack. If all else fails, buy a shaft drive bike with the optional training wheels for when you try to "gas it" on the way out of a sweeper. ihps3!ihldt!johnw ihuxt!johnw J. P. Wrycza