Mounting Flywheel Weight?

2 replies to this topic
  • Guest_Guest_*

Posted February 09, 2001 - 06:34 PM


I am in the process of looking for a flywheel weight and have found a couple but I am not sure if I want Bolt-on or Weld-on.
Any recomondations.........PRO's CON's????
How hard to "bolt on"
could I do it myself?
what size? 10/12/14/8?????

ride BLUE

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  • Boit

Posted February 09, 2001 - 11:01 PM


Check out the recent posts on this subject.

  • kmcbride

Posted February 10, 2001 - 02:34 PM


Just finished mounting 12oz. weight from Stroker ($42.00 + shipping) on '99 YZ. I bolted it on (bolts provided) so I could have the option of quick removal or change. You can send your flywheel to Stroker or A-loop (I think) to be welded on. The Stroker weight is slightly oversized, it fits over the back of the rotor. Therefore, much time is needed to assure centering of the weight on the rotor. I used shims to position on center then C-clamped together. You will need to drill through the rotor, I would recommend a press if available. You must center your pilot hole in rotor to match predrilled threaded holes of weight. I used some plastic drywall anchors and inserted them into the weight holes to use as a guide for drilling. Once pilot hole are done unclamp and complete drilling to size. I sequentially went up in drill size until bolt would fit (17/64 I think). You must also counter-sink holes as the bolts go in from the outside of rotor and screw into weight. If left sticking out they would hit inside of mag cover. Lots of patients here. The bolts do not have to be flush but 2mm is about as high out as you can go. A roto-tool works well here. I suppose you could also take a little material from the inside of the mag cover, it is only tight a the indent for the shifter. I did need to fine tune my rotor holes with a roto-tool to align weight on center. Even with a press drill bits will walk. I also rigged up my bench grinder as a pseudo lathe and attached the flywheel with new weight and checked for run-out using the adjustable guide of the grinder. I probably could have skipped this step as it yielded nothing and it took a while to rig the flywheel on the grinder. High -temp lock-tite or equivalent is an absolute must here for the bolts for the weight. I also used lock-tite on flywheel bolt. I think any good machinist could do the job for you or a welder for that matter. You will need a flywheel puller and a rotor holding tool as well as all the usual stuff (torque wrench etc.) Could probably get away without holding tool. I am not sure but I think 12oz. may be the limit for bolt-on. Size of weight would depend on the type of riding you do. I happen to ride a lot of tight technical stuff and rock / rooted hills. The weight keeps the bike chugging through this stuff and reduces stalling. The weight does flatten out the hit a bit, but there is more than enough left for me. Good luck, feel free to post of e-mail with questions.

[This message has been edited by kmcbride (edited 02-10-2001).]

[This message has been edited by kmcbride (edited 02-10-2001).]

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