Starting a little project

checkinpox

checkinpox

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Joined
Feb 22, 2014
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Location
Canada
Picked up a 97 XTC 600, 1600km on it. It's a deluxe with all the bells and whistles. Ran it a little last year, maybe 150km. It had a horrible midrange and sucked back gas like crazy. It has 100psi both sides, cleaned the carbs but it didn't change. This thing is all stock.
This year I picked up a few goodies for it. I picked up a set of vforce3 reeds, a new cobra track, and a set of tuner2 skis off a 2015 viper. Hopefully it will wake up a bit. Anyone try mounting tuners? The track and reeds are basic. But I don't think skis will be direct bolt on.
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100 psi is low. You're probably gonna want to open up the motor, sounds like you need a top end.
 
I thought the same thing but I also find it odd that both cylinder are equal. I am gonna probably thin the head gasket, take a look when I do that.

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It idles perfect, starts perfect and top rpm it pulls hard. So makes me think the carbs need to be adjusted, maybe check where the needles are at. Running 147.5 mains, and I think 45 pilots. But I didn't check where the needles are.

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I would start with taking another compression reading with another gauge. Then I would check the clutches.
 
I do need the primary looked at, the ring gear came loose last year. Caught it before it caused any damage. I had cleaned both clutches but the springs are all original and could be weak for sure.

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I'll have the top end off in a few weeks, Sled is getting picked up this weekend from storage. It would burn a tank of gas in 50miles. Should be better than that.

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Tore into the sled tonight. Installed the vforce reeds. Rechecked the compression enabled still 100psi both sides. But I think that's normal for this engine.

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But I am planning to thin the head gasket anyway so I pulled the head off. Everything looks great. No burnt pistons, cylinders look good. Exactly as I would expect a low mileage sled to look like.

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100 lbs of compression is about 10lbs away from not running if your guage is correct. Stock is 120lbs if not more. The layers in the gasket are 0.010 a piece. Only peel two layers (no more) or you will have to run race fuel. I found out with the 600 motors that the squish and compression maybe be well within the criteria to run a single layer gasket on pump fuel, however the plugs will read extremely rich yet you detonate and destroy a cylinder....
 
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also i have seen rings stick in a fairly fresh motor from sitting.

peel only 1 layer unless you are sure you are always going to have good gas in the middle of nowhere.
 
Well I peeled the gasket. I used all the thin pieces, just took out the thick one. Not going for monster power. After several pulls it fired up and ran pretty good. Didn't have my compression gauge handy to check but if I remember I will check it out tomorrow. But so far so good. Next stop the track comes out.

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Got the track out tonight. So much easier when you are not keeping the track.

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Once the winter season gets under way and you can get some mileage on her you mite gain 10+ psi in each cylinder of compression. I've seen it happen often enough,. Matter of fact last season my Venture 700 gained 10 psi across all three cylinders after the first 1000kms of riding. Just did the head gasket mod and gained another 5 psi .

Goodluck with your project.
 
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