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Hi I have a 90 L model 750, picked up as a project. Not sure how long it s been sitting but cylider 1 and 2 did not fire. 3 and 4 did and warmed up. Any suggestions on where to start with problem solving would be great.
 

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If it's been sitting, then you'll have to remove the carbs and clean them.
Inspect the spark plug wires, if they are damaged, you could be grounding out. Do you have spark at 1&2? It's likely not a coil problem if 3 & 4 are working, as 1&3 and 2&4 are paired together.
Do you have a manual?
 

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Discussion Starter #3
Hi, thanks for the reply. No haven't obtained a manual yet. But I was thinking carbs as the bike was sitting on it s side stand for a very long time.
 
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