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Anyone tested the 11.5:1? Anyone tested the 11.5:1?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 15 Apr 2014
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Anyone tested the 11.5:1?
I have 93mod XT600 and one Wiseco piston and cam/springs for this, its standard dim. I was wondering how it feel on the bike and what you guys think of the wear on the other parts when installing this?
Last edited by xtrock; 15 Apr 2014 at 23:30.
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Old 15 Apr 2014
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For this what ?
Quote:
Originally Posted by xtrock View Post
I have one piston and cam/springs for this, its standard dim.
Try being more articulate with your question you might get a reply. Make, Model, Year, K's, Brand of piston
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Old 23 Apr 2014
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I currently have an 11:1 Wiseco (96mm though)in my 3TB that is mostly rebuilt waiting valve work so I will find out how it works. I also have the high comp in another hybrid motor I'm building but it will be a bit till that bike is together.
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Old 23 Apr 2014
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Quote:
Originally Posted by jjrider View Post
I currently have an 11:1 Wiseco (96mm though)in my 3TB that is mostly rebuilt waiting valve work so I will find out how it works. I also have the high comp in another hybrid motor I'm building but it will be a bit till that bike is together.
Nice, let me know what you think after testing.
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Old 5 Jan 2017
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So what is your experience with the high com JJ? wondering if i should convert my 4pt engine.
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Old 6 Jan 2017
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So far just under 6k miles it's holding up fine . For a daily ride and long distance runner I'd stick to 10:1 to 10.5:1 max . Though mine has the small cc chamber head (first year or two 34L/K ) plus I had shaved some off the cylinder and head surfaces so it ended up closer to 12.5:1 . It does like to run hotter on the longer rides so a cooler is highly recommended . I run premium @ 91 octane , pings at lower grades. Another project I had wanted to try beside my EFI is a dual sparkplug , there is a place that one could be added and it would help the flame front , maybe really work good , it does on the 660 Raptors.

The stock carbs can't keep up with it and it goes flat at higher revs but has remarkable lowend right off idle , more than most other bikes I've owned , just doesn't stay that way all the way up . No problems running higher gearing . maybe the newer carbs will be better , don't know . I couldn't imagine what it would do with the CR31's or 33's .

My head gaskets like to leak , mostly just oil but I went to solid copper and it worked so far .
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Old 6 Jan 2017
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Ok thanks for update
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