Originally posted by: Quad4Fun
Hey Bear and TC............
I need to hook my dad up with you guys for a ride some day. He keeps bugging me about going.
He is a novice rider, but has a good idea. He's riding a Yamaha Kodiak 450.
Would like some easy stuff to start out with.
He has been riding in Montana and somewhere else back that way so far.
He'd fit in with you guys great. Not sure you'd get much riding done, cause he's into guns as much as you guys.
He's ok for weekday afternoon rides, but he doesn't get off work until 12:30 in Lakewood. Doesn't give much time.
Sure he wouldn't mind a weekend either.
He lives in Yelm.

Originally posted by: Bigdaddy660R
2mny The 1 thing I forgot to ask..........

Did Nicholas flycut your flywheel to reduce rotating mass ??????????

Did you HAND compare weights between the 2 flywheels ??????????

Originally posted by: 2mnyToyz
Well, the flywheel problem is solved.

I had no clue about lapping a flywheel on until Randy told me about it. Even the shop didn't know, since OEM motors and parts don't need it. They just bolted it on as the manual says to do. Since it coughs through the carb at times when it starts, it sheared the key every time it did that.

The shop sheared a couple keys and said they didn't know what to do. Randy suggested lapping the flywheel and I relayed that to the shop. The mechanic at the shop hadn't done this before and didn't clearly understand how to do it properly (keep in mind this is a factory shop, not performance). They sheared another key. They just loose installed the flywheel and put it back together for me to deal with.

I got an e-mail from Doug Nicholas and he said that the flywheel needed to be lapped. I now needed to know wtf was lapping. I called Randy and we chatted about it. Then I looked it up on the web and got a good understanding of how to do it.

Today, I went to NAPPA and picked up some valve lapping compound and brake cleaner. Went to the dealer with my new portable garage. Wheeled my machine into the trailer and inspected the flywheel and crank shaft. Since it had sheared several keys, it had some galling. I took some emery cloth and touched up the flywheel and shaft, then put the valve lapping compound on and rotated the flywheel 12 revolutions one way, then 12 the other. Checked the surfaces for uniformity, and repeated until I couldn't see any high or low spots. Then checked the surfaces with Prussian blue. I had to lap it 5 or 6 times before it had a good fit. I'm sure that the original installation would have been less. I cleaned up the surfaces with brake cleaner and installed the flywheel. I torqued it down, then removed the nut and followed ten's advice and gave it a sharp tap, then re-torqued it. Put it all back together and it fired up.

It did cough a couple times through the carb before it started, but this is normal. The good thing is it didn't shear the key! I shut it off and started it up a couple times.

Thanks to BigD, Randy, Bear, ten, and Josh for all the posts and advice.

It takes a few problems to learn how to do things.

I'm going to Beverly tomorrow to make a few passes. Anybody wanna go? I only have the drag machine, the two scrammys are torn down and waiting for carb parts. So I'll only be making passes at the east end, no trail riding. If 'da boy doesn't go, then I?ll ride his machine for trail riding if someone else wants to go.

Originally posted by: 2mnyToyz
No and no.

I don't think the flywheel was lightend. As it appears to have all the OEM marks still in it. Mind you, I haven't seen a lightend flywheel before, but because of the assembly of the flywheel, it could only be cut on the outside, and it has all the stamps still in it. In addition, Doug didn't seem to bat an eye at putting on an OEM flywheel, except that it needed to be lapped.

Originally posted by: TractorPacker
How much lighter is said flywheel supposed to be?

Originally posted by: 2mnyToyz
I can just e-mail Doug. Is there anything to pay attention to if there they both are OEM flywheels?

Originally posted by: TractorPacker
Don't tell redrod, but I'm gonna use his cylinder to beat him.