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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 5th December 2019
GA_Ironhead GA_Ironhead is offline
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+1. Use the advance mark for timing.

https://www.wwag.com/step/pdf/104729.pdf
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  #12  
Old 5th December 2019
Austinashley Austinashley is offline
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Quote:
Originally Posted by Nacs View Post
I know on my other bikes that originally came with points ignitions, when you retrofit the electronic ignition, you also have to change over to resistor plugs and non-resistor boots with solid-core HT leads.

Points bikes had resistor boots and normal non-resister plugs.

Arent some of the aftermarket advance units improperly timed right out of the box? That could be a factor.

On my first Yamaha rebuild, I installed the camshaft retarded one tooth, this somehow slipped past me and I was still able to get the bike timed and running. I rode for a season before I realized it was wrong.. I only picked up on the improper cam timing when I switched over to the electronic upgrade. I had to have the new timing plate (original one too) set to one extreme end of adjustment and it would barely hold idle and it was popping and just not sounding right, it did still run but it wasnt right. The electronic unit then failed shortly after I corrected the problem, mechanical regulator spiked. The 2nd E-ignition replacement also failed within minutes due to bad fitment on the cam.

I ended up switching back to points ignition and vowed to keep all my points bikes with original equipment. I enjoy the maintenance of points and being able to quickly them out. I think that points give a longer, less precise spark..which is just what an old machine needs. E-ignitions are too precise lol

So Im not sure if this is possible on these engines, but theres some ideas based on my other experiences.
Longer, less precise spark with the points system. Hmm. That would kind of make sense. I'm going out there today, I'm going to check everything everyone has suggested and try to snap some photos as well. I made sure to purchase 8mm resistor wire, I can't remember the exact type but it was the fancy stuff not the solid core wire that was used with points. Will this wire work with points if I try to switch back? I'd really like to use the dyna s system, I don't mind fiddling with points but many other people run dyna s issue free so I want to try and figure it out before I switch back to my points. Oh and yes I am going off the 40 degree mark in the inspection hole, the straight line.
Thank you all for your input it's always good to have another source of ideas and none of my friends in SFL have old iron!
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  #13  
Old 5th December 2019
Austinashley Austinashley is offline
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Update y'all!
Went out and was ready to get into some crazy troubleshooting mode then I took the points cover off and noticed I installed the megnetic lobe upside down! Flipped it over, static timed it and she fired off, no more popping or farting on decel, pulling stronger than ever. That's what I get for doing all my work outside...in the dark...
These bikes really haul ass! Very different from when I had the points.
Noticed a new *tick-tick-tick* from the front cylinder, increases with rpms. Sounds like a loosely adjusted valve, which makes sense because I adjusted the valves again before trying the electronic ignition and it wasn't making this sound before I did the adjustment, and I went a bit loose on my adjustment.

Thank all you guys for the quick replies, this forum is helping me achieve my dream of owning and fixing an ironhead
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  #14  
Old 5th December 2019
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A mechanic's stethoscope are a good wooden dowel to ear and motor to see what's ticking I don't like using screw driver cause it slipped one time and left a good scratch.If you do your valves do it on stone cold motor.
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  #15  
Old 5th December 2019
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Quote:
Originally Posted by Austinashley View Post
this forum is helping me achieve my dream of owning and fixing an ironhead
you just did!
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  #16  
Old 6th December 2019
Nacs Nacs is offline
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Yeap,working in the dark will get ya haha it took me a while to adapt to my current workshop situation, a large shed with no heat or power and pretty much packed with bikes. At least I know where everything is though.
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