Mark K wrote:Its interesting that the pretty new piston has an arrow to show you which way it will make the bike go.
Very few new parts are helpful like that piston, so any work on a bike usually needs to be followed by a "test ride"
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Mark K wrote:Its interesting that the pretty new piston has an arrow to show you which way it will make the bike go.
Bully fanatic wrote:I`m very sorry David. Test rides are classified as Practice and as you know in Twinshock Trials practice is banned and the word is also considered to be a very bad swear word! Shame on you!!!!!!
Rod wrote: I too love that whine from straight cut gears also on Fantics and Rotax motors.
I believe the quieter helical cut type transmissions spread load better but require thrust bearings to take the axial loads making these transmissions a little larger and heavier.
I like watching V8 supercar racing occasionally, you can certainly hear that straight cut gear whine when they give you cockpit audio, it's awesome.
With regards to Trials bikes, I think it was simply to reduce engine width and maybe reduce a little weight.
Rod wrote:Hey Greg, I don't have an answer regarding whine in my Fantic 300 but I like the distinctive sound it makes and assumed straight cut, my parts manual implies straight cut also, but the manual is from 1984 and a bit vague I suppose. I'm not about to pull the cover just to prove a point, maybe there was a change between the 240 and 300 ?
Those Aprilia Trials bikes wearing Rotax engines of the '80's and '90's certainly had a distinctive whine about them, so once again I assumed straight cut.
Bully fanatic wrote:I was racing a Bultaco MK 10 125 which was the 1977 model Pursang for a couple of years with BMCC and after every race I would have people who were watching come into the pits and ask if that Bultaco had primary gears. As some of you may know there was only a couple of the Bultaco models that had a gear primary drive in them and the late 125 Pursangs were one of them. The main other one were the El Bandito and the El Monterdero. It had a hell of a gear whine!
Greg Harding wrote:Hi Everyone,
David, do you have one of these alooooominium exhaust flanges?
While you are working on your today I rode my for the first time since we painted Denman GREEN. It amazes me how much you can vary the whine by varying the load with the clutch and by loading it up on hills. Along with all of the pops, wheezes and crackles of the exhaust note.
Just for the record Graham, I was not practicing! Just rehearsing for the KTSoundtrack.
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