1585 checked out

raced at Jurby airfield in the Isle of Man this weekend. did a best of 9.55@151 (not the best of conditions). had lots of problems.Nasty noises coming from the engine. i had raced on Friday and the last od 13 runs had this horrible erratic knocking noise from the engine. Saturday i stripped it down bottom end first. I had a worn 3/4 gear selector. it had at least 20 thou worn of the sides and the gear was floating catching the dogs of 5th and 6th. got the selector stelite welded and ground, got it running by 10pm.BUT I still had bad noises but more regular. In anger I blipped the throttle hard guess what the noise dissapeared. i raced all day Sunday and on the last run it came back! I feel sure it's the cam chain tensioner backing off but its all crazy at the moment.
I'm back home now so I'm going to strip the whole thing down and inspect everything.
Oh! One thing that is perfect still is the crank, rods, and pistons!
 
Jay, who does them (APE manual tensioner for Busa) in the Netherlands?

Jan Smit Power parts (or was it Jos Smit)?

Did I understand correctly BTW that there's no real need to turn engine into a particular position when "setting" the manual tensioner, like one normally does for removing/reinstalling cams and like I seem to remember Suzi's instructions told me to when exchanging original for recall tensioner?


[This message has been edited by Animal (edited 12 July 2000).]
 
Thanks, Jay, will very probably order one as I'm really concerned about the idea of that automatic tensioner failing now that I'm past my warranty (only 1 year here) already and no option for extended warranty here and of course Suzuki so far denying there's still a problem!
 
I believe in Richards earlier post, he made reference to 'busa powered race cars having cam chain problems using a manual tensioner.

We do a lot of work with these car racers and their situation is entirely different tham motorcyclist. They run the motors this way: full throttle, off the throttle, full throttle, off the throttle. Nothing in between. They destroy stuff that bike guys never do. It is to the point now that when parts show up at the shop, we can usually tell if the motor was in a car before reading the customers letter.

We have yet not heard of a single cam chain failure in a 'busa motorcycle or car with a manual tensioner.

Jay
 
Please excuse me, Jay. Being a complete novice compared with the likes of you and Richard, I just wanted to get a clear picture of the choices that you experts would make. Not knowing anything about the tensioner apart from the fact that the Mk1 was poor enough to warrant a recall by Suzuki and the Mk2 has been known to fail too, I'm obviously interested in the alternatives. I understand that Richard has been looking at a number of options, including modifications to the existing tensioner unit, and has been looking at manual systems too.

Having read (I think) the majority of the posts that Richard has made on this topic, I’m aware that the failures that he mentioned where induced in these racing cars, not the bikes. My point is however, that regardless of the use that the engine is being put to, the fact that the manual system had been seen to contribute to chain failure must surely mean that this system is inherently less reliable and robust then the automatic system. This assumption is based upon (and please enlighten me) the thought that both types of system are being raced in this class of car. I assume that the manual system is an option that some people have taken; rather then being a necessity because the use of the automatic system will guarantee chain failure in these circumstances.

I know the next time I see him I’ll be asking these questions with a view to having a manual system fitted if, in Richards’s opinion, they are more reliable.
 
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