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Whats the largest engine can swap on to a 81 yamaha xj550 frame?

Bike is a 81 yamaha xj 550 bobber. It runs great, just want a little more speed.

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Posted on Jan 02, 2017

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SOURCE: 1981 550 to 650 engine swap

the only thing you could possibly do is change out your swing arm off the 650 and put it on the 550 but you may also have to change out the wiring harness as well to get the 650 running properly

Posted on Jun 08, 2009

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SOURCE: 81 yamaha xj 650 spark plugs fire when engine

If you are saying the bike still continues to want to run, (rough running I am sure ), after the key is shut off then the engine is "dieseling". Carbon buildup on the piston / valves/ cylinder head is getting red hot from running. The hot spot(s) serve to ignite the fuel much the same as the spark plugs would. Burn only premium gas, be sure the cylinder is clean and not caked with mud or such, and change to a colder spark plug like NGK BP-8es or BP-9es ( BP-7es is the stock plug ). This may keep the engine cooler and stop the problem. The only other way is to pull the head then de-carbon it and the pistons. While the head is off, re-seat the valves using valve grinding compound. Check out Babbitts for parts. Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx Please rate my answer.

Posted on Feb 25, 2010

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the only thing you could possibly do is change out your swing arm off the 650 and put it on the 550 but you may also have to change out the wiring harness as well to get the 650 running properly

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Question about motorcycle


Hi christina

They did build a XJ550 (in line 4, not V) in the early eighties, But that's the only road bike 550 that yamaha made. Check it out here.

Hope that helps solve your puzzle :)

regards
robotek

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