1986 YZ125 compression

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2/9/2019 7:29 PM

What was the stock compression of a 1986 YZ125?

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2/10/2019 11:11 AM

According to the brochure: 8.4 ~ 10.5 : 1

Photo

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2/10/2019 11:27 AM

Thanks, how many pounds? Is 150lbs normal or low?

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2/10/2019 4:10 PM

150 is ok, but you should be about 170 or better when fresh. Below 120 and you will start having running issues.

Paw Paw

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2/15/2019 3:59 AM

Paw Paw 271 wrote:

150 is ok, but you should be about 170 or better when fresh. Below 120 and you will start having running issues.

Paw Paw

In cars, you test compression to "4th burp" on the gauge.
What is proper for 125cc 2T? How many kicks? & WOT
And I assume starting on comp.stroke could alter # of kicks??

Thx to those who may know more than I. mark

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