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-   -   YFM100...it's alive! (https://atvconnection.com/forums/yamaha/322683-yfm100-its-alive.html)

Geoff_NJ Jan 16, 2010 10:53 PM

YFM100...it's alive!
 
It's running...and then some!

I got the valves yesterday, woke up this morning once again to, "Daddy, when will my quad be fixed?" I told him, "Today, son...today."

I went to the marina, they had the lapping compound, gasket material and fuel line. [no charge, he owed me] I set up on the kitchen island and went to work on the valves. I lapped them in, cleaned it up and got all my little parts lined up. I couldn't quite rig up a spring compressor so, brute force [my thumbs are throbbing still] and small, 6-year old fingers set the clips. [no 6-year-old children were injured in the rebuilding of this head]

I put in the cam, rocker arms and coated it all with MMO. I cut a new cylinder base gasket and slapped it all back together. I removed the flywheel cover [had to drill out two cover screws] and had to clean out a real mess just to find the timing marks. It took about 2 hours to get it all back together. I had it set up just to run, no plastics or seat and fuel tank just sitting on the frame. I filled the carb and touched the button and bang, it fired right up.

I adjusted the carb and it idles really well. After it ran for a while, and all the smoke cleared ...lol... I decided to run it a bit around the field, just standing on the pegs. It scared the scheiße out of me. I wasn't ready for so much power from a 100cc. That little thing runs! I brought it back, put the plastics and seat back on and got the lights working...for what it's worth.

Anyway, since my costs so far are $200 for the quad, $50 for the valves, $5 for a plug wire end, $5 in gas and about 8 hours of my time, it's a pretty good deal. Now I have to fine-tune a few items, definitely turn down the throttle for my son, align the front wheels [it gets squirrely at 40MPH...lol...yeah I did the redneck thing and ran it down the road at 10 PM] and adjust the brake levers for my son's hands.

It was a good day...

wheily Jan 17, 2010 04:40 PM

good job...love those late night flybys lol

Geoff_NJ Jan 17, 2010 08:04 PM

http://forums.atvconnection.com/pict...ictureid=36077

http://forums.atvconnection.com/pict...ictureid=36078


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