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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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1275, big bore kit, custom build, custom oil tank, lithium ion battery

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  #901  
Old 10th May 2021
BestCoastXL's Avatar
BestCoastXL BestCoastXL is offline
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Originally Posted by Tomcatt View Post
I got these: https://sumax.com/product/409-pro-ra...lug-wire-kits/

I'm sure they added at least 10 HP...
I was leaning more towards something like this:

https://s7ns-noise.com/collections/ignition-wires
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  #902  
Old 10th May 2021
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I'm gonna end up throwing a mud ball on my fender just to detox from this purtiness.
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  #903  
Old 10th May 2021
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Quote:
Originally Posted by Hippysmack View Post
I'm gonna end up throwing a mud ball on my fender just to detox from this purtiness.
I had it out in the rain the other day....gasp

The one plug being a bit black tells me it is firing intermittently and those are plugs wires I made up according to a how-to from Revival Cycles.

The SE wires I have are known good ones so I'll swap those for testing and see if firing improves.

Seven Sins Choppers has some purdy wires. Once I reach an OFP (operationaly functional point) with the bike and am enjoying rides with no need to jump on the forum at every little noise those will adorn the bike as a crowning achievement point.
They even have glow in the dark wires. Snazzy. I think orange will be a good go.
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  #904  
Old 10th May 2021
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Originally Posted by BestCoastXL View Post
While I've got you both here,

The trans sprocket (front of belt) I remember as having a small amount of play on its axis. Am i worried over relative nothing?
The sprocket moves in an out a bit toward the case? Or counterclockwise/clockwise? I assume the transmission output shaft does have a bit of endplay, how much IDK. CCW/CC movement is just gear lash, probably normal.

John
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  #905  
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Quote:
Originally Posted by BestCoastXL View Post
Seven Sins Choppers has some purdy wires. Once I reach an OFP (operationaly functional point) with the bike and am enjoying rides with no need to jump on the forum at every little noise those will adorn the bike as a crowning achievement point.
They even have glow in the dark wires. Snazzy. I think orange will be a good go.
My SE wires were crap. I have some nice Taylor wires now, much better quality than the SE, and not very expensive. I'm rocking purple wires, everyone else has orange, red, or black. Taylors come in many colors.

John
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  #906  
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Quote:
Originally Posted by John Harper View Post
The sprocket moves in an out a bit toward the case? Or counterclockwise/clockwise? I assume the transmission output shaft does have a bit of endplay, how much IDK. CCW/CC movement is just gear lash, probably normal.

John
Towards and away from the case. Not an in and out movement but more like a teetering on the end of the shaft. Like the kind that would happen trying to balance a dinner plate on the end of a pencil
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  #907  
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So the sprocket is wobbling on the shaft? Since I have chain drive, I'm not sure how tight the belt sprockets fit on the splines. Most the dirt bikes I've worked on seem to have a bit of freeplay on the shaft, some are just held by a circlip. Seems like it's likely fine to me. I know I've installed some slightly "wider base" chain sprockets that put more meat on the splines of the output shaft.

John
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  #908  
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Quote:
Originally Posted by John Harper View Post
So the sprocket is wobbling on the shaft? Since I have chain drive, I'm not sure how tight the belt sprockets fit on the splines. Most the dirt bikes I've worked on seem to have a bit of freeplay on the shaft, some are just held by a circlip. Seems like it's likely fine to me. I know I've installed some slightly "wider base" chain sprockets that put more meat on the splines of the output shaft.

John
It probably is fine and if there were something wrong there would be belt/alignment issues beyond tracking and likely a constant noise from the primary/trans rather than a rhythmic noise that increases with rpm.

The noise seems to originate from there but I hear it almost as if it were inside the intake manifold.

I held my finger against the slide on the carb the other day and it didn't stop the noise.

I know aluminium is a great megaphone for noise and a noise in one place can be from somewhere totally different.

I'm hoping it's just chain adjustment, because I don't know what a flywheel out of balance noise is like. I imagine there's a severe amount of shaking at all speeds and not just shaking or buzzing at some.

Same should go for any issues with rods, and it seems to me those would eat themselves pretty quickly, especially with the addition of a big bore kit.
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  #909  
Old 10th May 2021
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Originally Posted by BestCoastXL View Post
I'm hoping it's just chain adjustment, because I don't know what a flywheel out of balance noise is like. I imagine there's a severe amount of shaking at all speeds and not just shaking or buzzing at some.

Same should go for any issues with rods, and it seems to me those would eat themselves pretty quickly, especially with the addition of a big bore kit.
You're obsessing again.

1. Check your primary chain adjustment.
2. Set your idle mixture screw to 3 1/2 turns out.
3. Loosen the engine mount bolts. Run the engine for about 30 seconds then tighten (torque) the engine mount bolts.
4. Go for a ride and see how it runs / sounds / feels.
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  #910  
Old 10th May 2021
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Primary chain adjustment can and will have influence on the vibrations, it will vary slightly in the "in spec" range. You did mention a whine from primary on decel, that could be your chain tad on the tight side.
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