Question about Motorcycles
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
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
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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