Balance shaft removal

[Devildog]

I was just wandering if anyone is losing the balance shafts on the heads when doing a race build up.

Are these there simply for a rider comfort issue, or does the engine tend to self destruct Harley Davidson style without them?

[Ricky J]

...d-a-m-n right.

Sorry for that. If memory serves the SBK RSVs were missing one of their twin balance shafts, but those were short-stroke SP motors with probably different balancing to a standard Rotax's.

[clarkie49]

sure, pull it out, i dare you :D

(everyone else.....step back :D )

we asked the italian engineers back in 2001 about it, they almost passed out but then they were they designers of a street engine not a race engine.

Bill Himmelsback from Blackmans racing told me he pulled one out just to see.

he said it vibrated like a motherf^cker on the dyno and made no more power.

but hey, if you are going down to bike nite pull the balance shaft out and take the mufflers off :D you might make some new friends.

clarkie

[RVZoo]

Originally posted by clarkie49
he said it vibrated like a motherf^cker on the dyno and made no more power.

Too bad. If I recall correctly, on the old Kwak ZX11 removing the balance shaft was worth somwhere close to 10 horses…

[clarkie49]

the gsxr1000 will make more power without the balcance shaft as well, but then again you can run an inline 4 race motor without the oil scraper rings to make more power, not on a twin though.

clarkie