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Author Topic: stock compression of a fj120o  (Read 4442 times)

Offline slack11

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stock compression of a fj120o
« on: February 18, 2012, 05:24:18 pm »
Just curious, what is the stock compression of a 1200, if it just came out of a bike.   
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Offline VMS Motorsports

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Re: stock compression of a fj120o
« Reply #1 on: February 18, 2012, 05:39:59 pm »
Depends on how the bike was taken care of for 20 years.
Not being a smart ass, but the numbers will vary greatly
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Offline slack11

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Re: stock compression of a fj120o
« Reply #2 on: February 18, 2012, 09:05:56 pm »
Just wondering if we run these at a lot more compression than stock, or if the 165 is comparable to a stock motor.  Not looking for particulars, just a general idea.
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Offline VMS Motorsports

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Re: stock compression of a fj120o
« Reply #3 on: February 18, 2012, 10:49:50 pm »
I believe stock they were in the 180 range. 165 was definately de-tuning them
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Offline Racinjj

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Re: stock compression of a fj120o
« Reply #4 on: February 20, 2012, 09:42:21 pm »
Jim is correct, I had a good stock motor in the bike and it was 180 across. 
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