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My son's 87 340 Indy caught fire today, So he said they took it off the truck and headed down the lake about a km and it started to bog, so he turned back and pretty much walked it back to the truck bogging all the way.
When he got to the truck the airbox was full of fuel and had caught fire from a backfire I think, I wasn't there.
Any Ideas?
We we're having bog problems with this one for awhile we thought we got it but today was the first real ride, and well...
Possibly piston rings?
 

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Check carbs. Possible inlet needles are not closing allowing fuel to just get pumped into engine.
 
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