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  1. #1
    urugol's Avatar
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    New to Yamaha Forum, GP1200R Project

    Hi all, I picked up my first ever Yamaha this week. 01 1200R as per the pics it is in very good cosmetic condition, but as with every bargain there is some work that I need to do and would appreciate any input from the Yamaha guru's I have been wrenching Polaris skis for the past year or so, but new to Yamaha.

    I will need to do a top end on this thing, it suffered a piston seizure on the PTO to the extent that a part of the Cyl also cracked off. The cause appears to be the PV which has a fair amount of damage, it didn't fall in just looks like it went in too far. I have read many of the stickies so I will also be doing a pump tunnel reinforcement as well as investing in some wave eaters. It is important to note that I want to keep this stock-ish for now but may consider some performance upgrades later (so please no put a 4-tec in comments)

    The pto dome looks to have taken on some partical damage as well but the good news is that the crank turns freely and there is no damage to the cases.

    So I have a couple of questions, firstly can the head be cleaned up or reused or should I just go get another one? If I get another I would consider going with a Riva rather than stock (I know I mentioned no performance)

    The crank case will no doubt have debris. Is there any way to clean it up without pulling the cases open? Just trying to simplify the job though I think I know what the answer is here.

    Pistons I will go for oem equivalent probably WSMs and get another Cylinder, light hone the 3 and do it as a set.

    Oh one other thing I noticed is that the gauge cluster is dead, is there a link for diagnosis of the cluster itself? In the event that I just need to swap it out, will a gp1300r cluster go right in as they look the same?
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  2. #2
    Hydrotoys's Avatar
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    thats a bad one. From the look of that piston, it ran a while after being dead. I'd say it needs to be pulled and the crank needs to be checked out.

  3. #3
    Moderator beerdart's Avatar
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    Welcome to the Dark side.

    I would split the case inspect the crank and change the seals. As for the head you can have a new stocker shaved to raise compression or find an aftermarket one it all depends on what kind of deal you find.

  4. #4
    urugol's Avatar
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    Quote Originally Posted by beerdart View Post
    Welcome to the Dark side.

    I would split the case inspect the crank and change the seals. As for the head you can have a new stocker shaved to raise compression or find an aftermarket one it all depends on what kind of deal you find.
    Thanks Steve, I guess I'll go down into the depths then. So pulling these engines requires all the fiddling with alignment I assume when fitting it back in?

  5. #5
    Moderator beerdart's Avatar
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    Alignment is easy with the spider coupler
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  6. #6
    urugol's Avatar
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    Well this is kinda what I didn't want to see. Looks like a good candidate for a weld - the crack is in one piece affecting the top part of the case only so I think I can get away with it. My concern is over the crank now, I will definitely need to get it inspected.

    Some nice debris pics from the intakes, one of my reed petals melted onto the cage as well.
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  7. #7
    PolarisNut's Avatar
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    OUCH. Yeah, get the crank looked at. It could very well be out of phase now. You'll really be po'd if you get it all back together and then realize it.

  8. #8
    WATER WOODY's Avatar
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    A good used set of cases go pretty cheap, i believe crashhard (Joe) has a set in the classifieds.

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