Anybody have any experience with lightened flywheels on Blasters?

[99LRDblaster]

My Blaster has been carrying revs and doesn't rev up and down as swiftly as I'd like. Not quite sure why(not an air leak). At any rate, lightening the flywheel would fix this problem. Now I know the gist of lightened flywheels with cars, and banshees, etc., but how well does it work with a single cylinder Blaster when you take off some of the rotational mass of the flywheel? I'm kind of just banking on that Yamaha was conservative with the weight from the factory as the flywheel feels fairly heavy for such a small engine. I was contemplating just taking off a tiny amount like 2oz off. How was other's experiences with it on their Blasters and who does work for it?

 

[DirtDiggler]

If it's carrying revs and the throttle response isn't crisp it's a jetting / airleak issue .

 

[99LRDblaster]

If it's carrying revs and the throttle response isn't crisp it's a jetting / airleak issue .

Already did leakdown.......sealed up like no other. 7.5 psi for 15 minutes......didn't budge......I could of let it sit for and hour and it wouldn't of probably budged.

Jetting isn't spot on..has banshee bog....but I'm dicking around cleaning the front brakes(what a PITA) and advancing the timing so instead of doing 2 different plug chops, I'll just advance the timing THEN jet down, but at any rate, I might be interested in lightening the flywheel some regardless if it's feasible on single cylinder engines. On multi cylinder engines, it's no concern as the reciprocating mass of the other cylinder manage momentum, but in a single cylinder, you only get power every 360 degrees, so I don't want to get into a situation where it won't idle or run at at low RPMs.

 

[hudack]

lots of people lightened there flywheels alot of people love em but alot of people hate em

 

[99LRDblaster]

lots of people lightened there flywheels alot of people love em but alot of people hate em

That's why I'm interested in hearing how much they took off when they did and/or where from. I probably won't go as extreme as them simply because it's a single cylinder.

 

[CHutzell]

You can take up to 8oz off a blaster flywheel and be safe,sounds like you have other problems tho

 

[lasxgames]

link

http://www.blasterforum.com/engine-13/lightened-flywheel-question-10053/

 

[92blasty]

You could always find a cheap flywheel on ebay, try lightening it, and if you don't like it you can still put the stock one back on.

 

[best]

I'd ditto the "If it's carrying revs and the throttle response isn't crisp it's a jetting / airleak issue" comments.
Re-check your pilot and needle.

I have run light and heavy flywheels on my KTM single cylinders.
With the KTM they also use smaller diameter to get the polar moment of inertia down.
With a light flywheel traction becomes a problem with tire spin off every bump.
Idle and take off are rough, typically higher rpm idle is needed and clutch feathering.
When dug in well, lower gears come on like a lightswitch, the bike feels a bit lighter
as well, turns better. Not much effect at higher speeds.

Heavier flywheels give a wonderful idle, great low rpm pulling, and often better take off
acceleration on dirt due to less tire spin (not always). Clutch feathering rarely needed.

Steve