Vintage Dirt Bike Q & A

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 Post subject: 1980 YZ465G
PostPosted: Wed Aug 10, 2005 7:38 pm 
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Joined: Wed Aug 10, 2005 7:28 pm
Posts: 4
Location: Oxford, CT
I have a 1980 YZ465 that I race in the Evo class and it is so hard to kick over. One day on E-bay I saw the same bike with a Compression release on it. I e-mailed the guy and asked him who made it and how it worked and he never mailed me back the A-hole. Anyway I was wondering if anyone new how to rig one up on mine. I would greatly appreciate it greatly. Thanks Bill :?: :?:

Please answer by e-mail if posiible mailto:ktm46@sbcglobal.net


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 Post subject:
PostPosted: Thu Aug 11, 2005 11:54 am 
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Joined: Tue Mar 15, 2005 10:35 am
Posts: 254
I have one on my Suzuki 400 that just screws in the extra spark plug hole. I'm not familiar with the Yamaha but if it has a two plug head, that is the way to go.

I've also heard of a design one of the european<???> manufacturers used. They mount the compression release on the side of the cylinder so it only works for ~the first 3/4 of the piston travel up. If you feel like spending a lot of money I will see if I can find the original reference.


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 Post subject: Compression Release
PostPosted: Sat Dec 31, 2005 9:30 pm 
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Joined: Wed Aug 10, 2005 7:28 pm
Posts: 4
Location: Oxford, CT
My YZ only has one spark plug hole but thanks.


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 Post subject:
PostPosted: Sun Jan 01, 2006 10:07 pm 
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Joined: Thu Oct 20, 2005 8:14 pm
Posts: 66
My '80 YZ465 kicks over just fine, starts fine too.....hot and cold.

You need to give it a proper swing, putting your weight behind the swing.
prodding it like a 125 will never get you going.

Checking and cleaning your carb could help, paying attention to the pilot curcuit.


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