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Old 05-08-2017, 01:41 PM   #121
VonWegener
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Default Re: Slabside Shovelhead

The mag sits nice in there. Dressing the fins really makes the difference.
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Old 05-09-2017, 01:20 PM   #122
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Default Re: Slabside Shovelhead

A little more progress last night. Mounted the mikuni VM38 carb and put this silly NOS cable wrap on the throttle cable



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Old 05-10-2017, 01:22 AM   #123
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Default Re: Slabside Shovelhead

Thats pretty.
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Old 05-11-2017, 05:09 PM   #124
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Default Re: Slabside Shovelhead

I remember those "cable covers" had them on my bike back then also ...

doesn`t look that shabby anyway
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Old 05-25-2017, 09:23 PM   #125
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Default Re: Slabside Shovelhead

Well, after months and months of messing around with this bike I gave a shot at tying to start her up. I had great hot spark from the Morris mag, sounds like I had good compression and fuel was getting to the Mikuni, but no luck. I think I need to give the carb a little tuning with the air mixture screw, but not even a little sputter was disheartening �� If anyone has any experience tuning a Mikuni on a shovelhead, any tips would be appreciated.
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Old Yesterday, 06:37 AM   #126
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Default Re: Slabside Shovelhead

Jetting? And are you sure on the timing? Plugs wet?
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Old Yesterday, 07:32 AM   #127
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Default Re: Slabside Shovelhead

For sure on the timing, I followed the step by step instructions from Morris
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Old Yesterday, 07:47 PM   #128
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Default Re: Slabside Shovelhead

How do you know you are getting good spark when the plugs are in the bike and fighting the compression?

Kicking a mag fired bike requires a very fast kick. Speed is everything. I learned this by putting an inline tester between the spark plug and spark plug wire. Lights up when plug actually sparks. Kicked bike in the dark to see what it took to get good spark in real life conditions

The testers are pretty cheap and is a quick and easy way to determine if your problem is carb or ignition. If it is a mag issue there are a few tricks I can tell you to make things easier. If its the mikuni I know nothing.
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Old Today, 05:48 AM   #129
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Default Re: Slabside Shovelhead

Inline tester is a good call Devo, never thought of that. I checked spark by pulling one plug at a time, grounding it against the case and giving the bike a good kick. Each plug had a nice blue spark, but like you said that could be different when in the cylinder fighting compression
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Old Today, 09:13 AM   #130
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Default Re: Slabside Shovelhead

Plug gaps at .025-.028 ?
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Old Today, 12:35 PM   #131
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Default Re: Slabside Shovelhead

According to Morris plug gap for magneto should be 0.020-0.025. Smaller the gap the easier it is to kick over. I run mine at 0.018, but mine is running 11 to 1 compression ratio.
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Old Today, 01:05 PM   #132
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Default Re: Slabside Shovelhead

oops memory isn't what it used to be. Hunt say's .018-.025 and solid core wires and no resistor plugs.
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Old Today, 04:09 PM   #133
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Default Re: Slabside Shovelhead

Quote:
Originally Posted by joe49 View Post
oops memory isn't what it used to be. Hunt say's .018-.025 and solid core wires and no resistor plugs.
I had to look those numbers up myself... to many things to remember obout these bikes for any one person to remember haha
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Old Today, 04:45 PM   #134
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Default Re: Slabside Shovelhead

Quote:
Originally Posted by 750Devo View Post
I had to look those numbers up myself... to many things to remember obout these bikes for any one person to remember haha
Haha so true! Thanks guys, I'll scope the plug gap. I got my wired direct from Morris when I picked up the mag, using their suggested Champion plugs as well
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