rear cylinder is miss-firing…everything checks out

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Jan 19, 2017 | 03:07 AM

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senor honda

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rear cylinder is miss-firing…everything checks out

james
hi! i just put together a new top end for 1988 sportster with nhrs stage 2 thunderstorm heads and new pistons/cylinder work by nhrs…i’ve completed the “heat cycles” and took her for her first easy mile ride…i’m using a mikuni hsr 42 carb and cycle shack 2 into 2 pipes…running compu-fire 21850 selectable electronic advance ignition…static timed it…my prob is the rear cylinder is miss-firing…everything checks out…no intake manifold leaks or exhaust leaks…rear cylinder feels cooler than the front cylinder…timing?? carb?? i can’t figure it out…thanx!! -james.

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Jan 19, 2017 | 03:08 AM

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senor honda

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Customer Service Techs Hi James
Make sure the pushrods are adjusted correctly.
Check ignition timing
Try swapping the spark plug wires. Front to rear / rear to front. See if anything changes.

Jan 19, 2017 | 03:09 AM

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senor honda

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james
hi! did a compression test with engine at op temp, front 195+ rear 195+….readjusted pushrods, rechecked timing, good spark, battery good…still misses on rear…plugs?? starter solinoid?? havn’t checked charging system, not sure how to…nothing changed swapping plug wires…i don’t get it… ugh.

Jan 19, 2017 | 03:09 AM

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senor honda

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Jan 19, 2017 | 03:10 AM

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senor honda

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Customer Service Techs
Hi James. As far as testing compression goes; it is typically better to test Compression, cold, when you are trying to diagnose a performance issue. Testing compression @ running temperature is fine, but expansion from heat can sometimes disguise a problem.
Make sure that you are adjusting your pushrods, cold. Also, you need to be confident that your Andrews cams were installed/timed correctly.
You may have a failing ignition, or coil.
Check your charging system and check for an intake leak.