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Old 01-19-2013, 06:36 PM   #1 (permalink)
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Unhappy yamaha xl 1200 help

hi everyone

i had this thread posted in another forum but didn't get any replies. does any one have ant ideas on what i should do?????


I have a rebuilt engine for my xl 1200 and since putting the new motor in i'm having problems with it idling. It'll idle on land but when it goes in the water it dies. When I get it to idle in the water, when you take it out it revs like crazy. When i put the new engine in I cleaned out the carbies and they all looked fine, I didn't touch any of the original carbie settings. I also noticed that there isn't a stream of water shooting at the back of the ski, but it isn't over heating. Coz its a rebuilt engine i was told to premix the fuel at 50-1 with 2 stroke oil but its still pumping oil from the oil tank into the carbies.
Other than the idle it runs fine apart from a little bogginess which I think is from the extra oil in the fuel.
Any suggestions on how to get it running better?

found the problem. i did a pressure test and it turns out the rebuilt engine i brought had a crack in the top half of the crank case and had been welded but had not been welded properly so the cylinder closest to the back of the ski had been drawing in air through the crack and running lean. the question i have now is- the engine is covered by warranty but because i have to drive 4 hours each way to swap engines i was thinking of just getting the case re-welded closer to home to save time and money(its a easy fix no need to pull motor apart to weld)

i am a little worried about the cylinder tho. As i was running the engine in there was plenty of oil (i think. because i was running premix 50-1 as well as the oil injection) so i was hoping i didn't do to much damage(had only done about 3 hrs before i found the problem and i was taking it easy. nothing over 6000rpm)

any advice would be greatly appreciated
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Old 01-20-2013, 07:48 PM   #2 (permalink)
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I'd take it back and demand a new engine. Welding the case is very difficult to do correctly, and I'd be surprised if you didn't do some damage to the 3rd cylinder and piston.
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Old 01-21-2013, 05:17 AM   #3 (permalink)
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thanks for the advice

i rang the guy who sold me the engine today and asked if he would exchange the engine and he said no, because I'd already used the engine. If I wanted to take it back he would re-weld it for me or I could fix it myself. So I told him where to go, and NEVER dealing with them again!
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