Tries to start but won't catch
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1st Gear
Joined: Jun 2024
Posts: 5
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From: British Columbia
Tries to start but won't catch
1990 harley fxstc 80ci...I put the bike away in the winter running very well , in the spring I removed the the rocker box on the rear jug to replace the rocket arm bolts , after re assembly the bike started and ran for 45 seconds and than stopped and won't start but it tries too...I've replaced the kill switch , the ignition sensor and the coil . Rebuilt the carb , fresh high octane gas and new plugs and wires... the bike started and ran somewhat rough but gas was coming out in a misty form. ...after several runs now the bike won't start but tries too again and also a few back fires ... this all with the ignition sensor at full advance...tried starting it at full retard and all points in between and will only attempt to start at full advance and thats with fuel blowing out the carb ..... what am I missing here, any ideas would be appreciated.
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
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From: Coromandel Peninsula New Zealand
Talk us through how you replaced those rocker bolts....all at once, one at a time, what torque setting, did you soak the oil up outta the thread holes? Yadda, yadda, yadda. Always look at the last thing you did...I got bolts on my shovel that are older than most adults....they'll last a few decades more.
Thread Starter
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1st Gear
Joined: Jun 2024
Posts: 5
Likes: 0
From: British Columbia
Talk us through how you replaced those rocker bolts....all at once, one at a time, what torque setting, did you soak the oil up outta the thread holes? Yadda, yadda, yadda. Always look at the last thing you did...I got bolts on my shovel that are older than most adults....they'll last a few decades more.
Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
130-140 is good, stock was 155-160 new.., It almost sounds like as if your ignition might have went out of whack.. Check to see if you got any goo coming out your cam position sensor And do you have a spare ignition module You can just throw into test??
Also are you absolutely sure the float bowl is clean of debris and your getting enough fuel??
Also are you absolutely sure the float bowl is clean of debris and your getting enough fuel??
Last edited by 98hotrodfatboy; Jun 3, 2024 at 09:53 AM.
Thread Starter
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1st Gear
Joined: Jun 2024
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From: British Columbia
Thanks for the suggestions but as I've mentioned, new coil new sensor and new kill and start switch all wired correctly , the icm is Questionable but with that said I'm getting spark from both plugs , that Particular icm is near impossible to find but can be Eliminated by installing a dynatec 2000i Programmable digital ignition....something i will consider if I can confirm it's the icm
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Joined: Oct 2015
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From: Pine Flat Dam/South Bay Area, CA
The rocker box bolts are not a wear item and do not need to be changed unless the threads are stripped or have been over torqued. I've read factory shop manuals cover to cover and in no place does it state that the rocker box bolts need to be changed after a certain amount of miles or time. I don't understand the logic or the reasoning behind this.
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Thanks for the suggestions but as I've mentioned, new coil new sensor and new kill and start switch all wired correctly , the icm is Questionable but with that said I'm getting spark from both plugs , that Particular icm is near impossible to find but can be Eliminated by installing a dynatec 2000i Programmable digital ignition....something i will consider if I can confirm it's the icm