High Idle, Smoke Coming from Exhaust - Page 2 - Honda Shadow Forums : Shadow Motorcycle Forum
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post #11 of 32 (permalink) Old 05-18-2019, 12:32 AM Thread Starter
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I just took the rocker arms off where the cam holder is.
Didn't directly mess with them.
But friend said he might've adjusted them at the wrong time rather than at TDC

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post #12 of 32 (permalink) Old 05-18-2019, 12:47 AM
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Possible it was on the wrong cylinder TDC mark. If you take out a spark plug and put a plastic straw or small dowel into the cylinder and turn the engine slowly till the piston is at the very top TDC, and all the valves are a little loose, that is the correct position.


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post #13 of 32 (permalink) Old 05-18-2019, 01:13 AM Thread Starter
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Quote:
Originally Posted by swifty2014 View Post
Possible it was on the wrong cylinder TDC mark. If you take out a spark plug and put a plastic straw or small dowel into the cylinder and turn the engine slowly till the piston is at the very top TDC, and all the valves are a little loose, that is the correct position.
I'll check that next, I'm hoping it's something as simple as that and not a scoured cyl wall/piston.
I'd be sad as hecc.
It's a teardown kinda night at Midnight LOL
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post #14 of 32 (permalink) Old 05-18-2019, 01:34 AM
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A compression test may be in order. Wide open throttle should be up to 180 + pounds.

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1983 750 Shadow
From the past=
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1962 Honda 305 Dream
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1971 Honda 175 scrambler
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post #15 of 32 (permalink) Old 05-18-2019, 05:41 AM Thread Starter
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Quote:
Originally Posted by swifty2014 View Post
A compression test may be in order. Wide open throttle should be up to 180 + pounds.
I did one previously, but i'll probably do another once everything's finished and put back together.
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post #16 of 32 (permalink) Old 05-19-2019, 11:38 PM Thread Starter
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Alright, small update here.
I redid the valve adjustment for the rear cyl. They did seem quite a bit loose.
I'm also going to put a 102 and a 106 Stage 1 jet kit that I removed before back in and setting the needle to 2nd notch down from the top.

Hoping with all of this done.. that it's all set and good.
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post #17 of 32 (permalink) Old 05-20-2019, 01:36 AM Thread Starter
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Alright, well.
I for sure did things right this time around, put everything back together, made sure it was all relatively decent in terms of jets, tubes, settings, etc.
my last idea is possibly a carb sync???

Like, beyond that there's major issues like piston rings or scoured cyl wall.
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post #18 of 32 (permalink) Old 05-20-2019, 02:22 AM Thread Starter
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After letting the engine warm up so I could sync things, it basically spews smoke now when accelerating even in Neutral..
I'm going to compression test it tomorrow to see if it's the piston rings.

If it isn't.. then i'm at an ABSOLUTE loss.
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post #19 of 32 (permalink) Old 05-20-2019, 06:11 AM
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1) When was the last time the bike ran perfectly?

2) What changes were made to the bike after it was running perfectly?
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post #20 of 32 (permalink) Old 05-20-2019, 09:14 PM Thread Starter
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Quote:
Originally Posted by Chuck_Michigan View Post
1) When was the last time the bike ran perfectly?

2) What changes were made to the bike after it was running perfectly?
Before I did these changes really, though it wasn't "perfect" as the rear idle has always been kinda lumpy and I was having some low-RPM shakes.
Which is what caused me to assume it was valves really.

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