A Motorcycle Thread About Absolutely Nothing!

Steinhauer said:
When the PO dropped the bike, it broke the timing belt pulley and tore up the timing belt. I am pretty sure that was when the valve kept striking the piston.
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I now understand, oh poor PO. I agreed with Catty in post #1862, stated "Sound like Biker was careless on motorcycle which he dropped it"...

Do you know what broken exhaust head valve causes? Jiro? The Highlander? Everyone?
 
I have had the engine back in for a couple of days now (picture taken a couple days ago):

gl1100x16.jpg


There is something kind of minor I have to do before Crank it. The shift fork is not connecting with the transmission (I have to take the radiator out, drain all fluids - but I do not have to take the engine out ... whew!!!)
 
deafsmogtech said:
I now understand, oh poor PO. I agreed with Catty in post #1862, stated "Sound like Biker was careless on motorcycle which he dropped it"...

Do you know what broken exhaust head valve causes? Jiro? The Highlander? Everyone?
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no idea. I've never done this kind of extensive mechanical work like taking engine apart and back.
 
Jiro said:
no idea. I've never done this kind of extensive mechanical work like taking engine apart and back.
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The only way you will ever learn is by taking things apart. You can read all the manuals on how to do it - but you will never truly learn until you sit down and take one apart.

My next door neighbor (when I still lived with my dad years ago) was a retired Air Force pilot. He was a B-17 pilot in WWII and Korea. He had a wrecked plane in his backyard barn.

I wish I knew then what I know now - I would have been in his backyard barn putting it back together for him.

edit to add: Don't "learn" on an expensive bike - buy an older metric bike that someone has neglected and learn on that one first.

make him an offer ;)

http://newjersey.craigslist.org/mcy/2797637841.html
 
deafsmogtech said:
I now understand, oh poor PO. I agreed with Catty in post #1862, stated "Sound like Biker was careless on motorcycle which he dropped it"...

Do you know what broken exhaust head valve causes? Jiro? The Highlander? Everyone?
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Easy, overheat due bad A/F (raw fuel) or bad t-stat or other i forget.
 
The Highlander said:
Easy, overheat due bad A/F (raw fuel) or bad t-stat or other i forget.
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You are right and one wrong.... bad A/F (raw fuel) referring to richer Air/Fuel mixture, is NOT causing the overheat...

Simple, my answer is High Combustion Chamber Temperature.... the extreme heat gas flows past the exhaust valve seats then the stems and exits the ports (occur in exhaust strokes where the exhaust valves opens). They make the exhaust valves suffer, stress and fatigue over time, the head of the exhaust valve will break off from the stem and drop into the cylinder(s), just happen when the exhaust valves closed because the valve springs pull the stems to closing after complete exhaust stroke. The broken head drop in the cylinder, is more likely to be occurring in the intake stroke.
 
Causes of High Combustion Chamber Temperature:

1) Over advanced ignition timing

2) Overheating = Insufficient cooling system

3) Lean air/fuel mixture

4) Too low octane

Note: High Combustion Chamber Temperature can cause elevated NOx level.
 
deafsmogtech said:
You are right and one wrong.... bad A/F (raw fuel) referring to richer Air/Fuel mixture, is NOT causing the overheat...

Simple, my answer is High Combustion Chamber Temperature.... the extreme heat gas flows past the exhaust valve seats then the stems and exits the ports (occur in exhaust strokes where the exhaust valves opens). They make the exhaust valves suffer, stress and fatigue over time, the head of the exhaust valve will break off from the stem and drop into the cylinder(s), just happen when the exhaust valves closed because the valve springs pull the stems to closing after complete exhaust stroke. The broken head drop in the cylinder, is more likely to be occurring in the intake stroke.
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well, I am not 100% perfect correct.

deafsmogtech said:
Causes of High Combustion Chamber Temperature:

1) Over advanced ignition timing

2) Overheating = Insufficient cooling system

3) Lean air/fuel mixture

4) Too low octane

Note: High Combustion Chamber Temperature can cause elevated NOx level.
Click to expand...

I keeps confused between rich and lean for air/fuel mixture cause kill CAT. Thanks for remind me.
 
The Highlander said:
That's for carb only? That's mean newer motorcycle don't need it due they use fuel injection?
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Right. For carburetors. If you molest 2 or 4 idle (speed idle) screws on the throttle bodies of the fuel injected motorcycle, you may need a carb sync. How? I learned a lesson that I tampered 2 idle screws on the throttle bodies of my Alfa Romeo GTV with a mechanical fuel injection, messed up unbalanced speed idle, not to A/F mixtures. I turned the screws off from the stops, re turn the screws at same amount of turns. The speed idle was normal.
For one throttle body ( one butterfly plate ) for any fuel injected engine, you don't need a carburetor sync.
 
For a single barrel carburetor is no carb sync used. Nothing. Just tune A/F mixture and idle speed screws. Some single barrel carbs have air bypass screws, found in late VW models. I hate air bypass screws, hard to tuning.
Anytime you see the carburetors, never adjust any screws around the carburetors before you check dirty air filters (restricted air filter causes richer A/F mixtures) first as always same as cars. If clean air filter then check vacuum leaks, if ok then check fuel filters or restrict fuel lines or rust debris in a gas tank. If ok then check valve clearances,timing and compression. Many times I see the mechanics who tune the carburetors to obtaining good idle or smooth then they end up with the carburetor overhaul then they found low compression or broken vacuum hoses. I practiced to tuning the carburetors in lawnmower engines and go kart.. I gained my experience with those carburetors.
 
^^^^^^ He/she must have paid a premium to have the pegs moved up. Probably the automatic trans model with power steering....it takes some upper body strength to steer those things at low speed.
 
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