82 1100e rough running, poor compression, etc

[AJ]

What am I missing here? Low compression without oil, slow to come up on one cylinder, compression restored with oil and comes up right away. What part of that needs electrics, carb boots, or even welded/pressed cranks to understand?

And, no, 43K is not excessively high mileage for this engine, but it's not exactly low either. The '82 11E was a high power musclebike of it's day, likely to be flogged regularly, air-only cooling, & no oil cooler. Even has poor oil pickup on it's sidestand. These engines get ratty with miles. Goes with the territory.

[tom203]

What am I missing here? Low compression without oil, slow to come up on one cylinder, compression restored with oil and comes up right away........

Maybe, but howling60's first post said......

".....half way through first day the engine started to run a little rough.. just a slight vibe could be felt. continued w/no real change for the rest of the 2 days. When i got it home (maine) it got worse... I tore down the carbs, cleaned them, shimmed the needles, bench sync. Put back together, same result. really rough idle, doesn't smooth out anywhere in rev range"

This vibration stuff could be crank problems- beats me, but I'd check since these monsters likely get flogged and some have had crank problems based on what I have read here- I love one piece forged cranks!

[Big T]

good call. I often overthink it. This would certainly be the quickest/easiest way to check the entire assembly.

4 plastic soda straws, 1 sharpie

Pull the plugs, insert straws in cylinders

Pull the ignition cover, rotate crank - see if the straws hit TDC in pairs

Set 1-4 TDC, mark straws
Set 2-3 TDC, mark straws

Pull straws and check the relative position of the marks

If your crank is twisted, it needs to go to a specialist who has the jig for it.

[AJ]

Maybe, but howling60's first post said......

".....half way through first day the engine started to run a little rough.. just a slight vibe could be felt. continued w/no real change for the rest of the 2 days. When i got it home (maine) it got worse... I tore down the carbs, cleaned them, shimmed the needles, bench sync. Put back together, same result. really rough idle, doesn't smooth out anywhere in rev range"

This vibration stuff could be crank problems- beats me, but I'd check since these monsters likely get flogged and some have had crank problems based on what I have read here- I love one piece forged cranks!

Agreed. And Big-T's soda straw test is simple enough to do that it's worth checking. At a minimum, there would be the peace of mind if h60 learns his crank is good.

Either way, it sure sounds like this motor is coming apart. Let's hope it's not the crank. That becomes a much bigger project.

[howling60]

Agreed. And Big-T's soda straw test is simple enough to do that it's worth checking. At a minimum, there would be the peace of mind if h60 learns his crank is good.

Either way, it sure sounds like this motor is coming apart. Let's hope it's not the crank. That becomes a much bigger project.

I like it!

on the upside... GRC is a 10 minute drive from me... and i've heard MUCH discussion about his crank work here on these boards

Unfortunately for me... i've been too darn busy to do any testing since my last post.

Will be hoping to get to it in next week or so... i already feel riding season running away from me... again

-Nate

[AJ]

I like it!

on the upside... GRC is a 10 minute drive from me... and i've heard MUCH discussion about his crank work here on these boards

Unfortunately for me... i've been too darn busy to do any testing since my last post.

Will be hoping to get to it in next week or so... i already feel riding season running away from me... again

-Nate

Now that I read your original post, I'm even thinking ignition should be looked at. We're any of your (new) spark plugs appreciably darker or wetter than the others?

That still doesn't deal with the compression issue.

[tom203]

As an alternative, maybe it's time to rescue another Suzuki from Maine CL - there are more each day. My mom used to rescue cats and I think I inherited a similar gene though I'm trying to fight it.