Grant demystifies the black art of Tire Changing and Repair to help you STAY on the road! "Very informative and practical." See the trailer 
Cotton or synth sweat-wicking t-shirts with the Horizons Unlimited logo on the front and a snappy slogan (changing every year) on the back.
Show your route on your panniers. Great conversation starter when you meet people on the road!
Motorcycle and travel books to inspire and inform you!
ll 5 DVDs with a custom printed slip case. "The series is 'free' because the tips and advice will save much more than you spend on buying the DVD's."
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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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#1
14 Mar 2009
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High Compression Problems
I'm in the middle of a rebuild (among other things
 ) on my 1990 XT600E right now, I'm at the point now where I need to order a piston. I'm going from stock to 96mm.I tried posting on ADV Rider and just got a slew of redundant posts with no real experience backing, I suppose they were all just taking a break from installing their RAM mounted Garmin Zumo on their R12GS, and a 12v outlet in their Jesse Luggage to keep their coffee warm. Anyway, my question is how does the XT handle a 11.5:1 compression Wiseco piston? How much a power gain can I expect? Are there any problems with the extra heat? Timing issues? Starter trouble? Head gasket problems? Crank? Pin? Rings melting themselves to the piston? I use the bike for everything from long distance (couple thousand miles) touring to tight singletrack trail riding to laying through twisties like a supermoto wannabe in North Carolina, and sometimes all of the above. 
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#2
14 Mar 2009
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I dont know alot about them, But. I do know I`ve got one in my 1990 xt. Its been there for the last 20 thousand miles or so.
No problems at all. Cant help on the power gain tho, Didint ride the bike before the piston went in. HTH Pete
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#3
10 Jun 2011
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Bumping up this thread because it's some pretty good question that some of us might've already asked ourselves.... I sure have!
Vando 
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#4
10 Jun 2011
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I read somewhere there is a bit more vibration but noticeable power gain,
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#5
11 Jun 2011
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I was actually contemplating getting one of those when I thought my engine got f-ed up...
Instead it was just broken camshaft chain and both exhaust valves bent... saved me quite some €€€ haha
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#6
12 Jun 2011
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xt info
hi the person you should be asking is david lambeth (xt guru) does post on here thanks steve
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