Crankshaft rotating mass reduction?

[flipper]

I am in the process of converting a 2001 TT600R (kickstart only) to an electric start - much like Yamaha did for the TT600RE in 2004.

Part of this conversion involved swapping the TTR crankshaft for a 3AJ XT600 one to get the longer crank taper end for the starter gear and associated parts. The engine is now effectively a 3AJ one with a TTR gearbox and primary gearing.

One thing that bothered me was the additional weight being added to the crank with all the extra components for the e-start. I like the throttle response of the original TTR engine, and am concerned that this will be lost by doing this conversion due to the additional rotating mass.

So I started looking into alternative cranks and flywheels that might suit. It appears the 2003 era raptors have a T-bone style crank and smaller flywheel that may fit, and some of the XT660 around that time also did.

Via the forum search, I saw that there were a few posts about people considering crank swaps to use the 660 versions, but no-one seems to have posted about a finished result.

Did anyone actually do this crank swap, and was there a substantial weight loss on the crank?

Thanks,
Peter

[jibber]

I remember posting about the Raptor crank but was assured it would not fit, looks mighty similar.

[flipper]

Thanks for the reply.
I'm keeping my fingers crossed that someone on here has actually tried it, and has either had success, or has a detailed reason why it didn't work.

[jibber]

Search 'raptor' under my posts, xtrider I think it was

[flipper]

Thanks - I missed that one somehow. Sounds like this idea is a 'non-starter' then.