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3.5 cylinder bike

  • Thread starter Thread starter crazedfooter
  • Start date Start date
Mr. Brown said:
I'm having the exact same problem on my GS850 right now. Same chamber even. Done the plug/wire/cap swap dance with no luck. Still have to do the petcock bong hit. My plug is very oily and gassy, so that could be a good lead...

You guys rock...:twisted: :-({|=
Click to expand...
Just don't spill the bong water Gross!
 
crazedfooter said:
this may be a stupid question but how do you use a caliper to take that measurement?
Click to expand...
I see that TheCafeKid already posted some pics, here are mine:

IMG_2162.jpg


It helps if you turn the blade so it goes over the float to get an accurate measurement, but this shot shows you where to measure.

IMG_2161.jpg
 
hehe...much clearer pics steve..mine blurred a bit..plus yours show the CV place to measure...mine are mech carbs, so the floats are different Crazed but there ya go!
 
Anyone with the CV carbs, IF cyl #2 has problem. Disconnect & plug the vacuum line. Then run the bike on prime, Most of the time it will fix the problem, If not you still have a problem with the carbs
 
Sweet...but what is the problem that it is fixing? I dont have em, but just curious in case i run into it later on in GSing career.
 
I'd definitely recommend checking your valve clearances. You don't have shims, so it's not a hard job and it's always great to know.
 
checked the clearances tonight, they are all a bit tight, i couldn't get the .038 mm into any of em really. so, im gonna try to adjust that tomorrow and see if that helps.


sqdancer did the prime with the pluged vacum line, no change.
 
Cold cylinder

Cold cylinder

You may possibly have a burned valve since you mention that your compression is low in #2. Blown head gasket would also be possible but probably unlikely.

If adjusting the valves doesn't do the trick, I think you should perform a leak down test which will most likely indicate where the problem lies. By all means, let us know; if you do a search, you'll find scads of other threads that are strikingly similar. I'm really curious to know what you find!:-s
 
ironriot, you were right, the float heights were off but i don't think that was the problem because they were all off by about the same amount. 1-1.5 mm. #2 was about 1.1 off.

gonna get the tool for the valve adj. like i said they all seem pretty tight so we'll see what that does for me.

chucky (or anyone) how would i know if i had a burnt valve?
 
Lean down

Lean down

crazedfooter said:
ironriot, you were right, the float heights were off but i don't think that was the problem because they were all off by about the same amount. 1-1.5 mm. #2 was about 1.1 off.

gonna get the tool for the valve adj. like i said they all seem pretty tight so we'll see what that does for me.

chucky (or anyone) how would i know if i had a burnt valve?
Click to expand...
Well, to start with, I really hope you don't but you've got to find out one way or another. I think you mentioned that your compression is low on #2 so....even if you did have problems with your petcock, your coils, your plugs, etc., that would have no effect on your compression.

If your compression is low, it's leaking somewhere. A cylinder 'leak down test' will tell you exactly at what point in the piston cycle, you're losing compression (and, thus, where the problem lies). The tool to do the test can be purchased for about 40 bucks from Harbor Freight but you would also need a compressor in order to do it.

You have to know what you're doing in order to diagnose it correctly but there are pretty good instructions available on the internet. Without the tester and compressor, I think I'd go ahead and pay someone to do it; if he knows what he's doing, he will be able to tell you exactly where and what your problem is. I hope it isn't too serious but please let us know when you figure it out. Good luck!:) (As I mentioned before, I'd start by adjusting the valves.)
 
So I checked the petcock (Yack!) and no leaks there. Went to the local salvage yard and yanked an ignition coil off a rotting carcass. Took it home, hooked it up... same issue. Other headers get HOT, #2 gets lukewarm. Lots of smoke coming from the junction of header #2 and the H-joint.

Never had the exhaust off, and no time like the present. Ripped it off, only breaking off one bolt. Headers are fine, H-joint is a rotted piece of swiss cheese. Pipes are good, no clogs. Wait, shouldn't there be a gasket where the headers meet the head? Like, maybe a remnant of a gasket, or film, or something? Nada, nowhere.

So now I gotta do the extract stuck bolt, replace nonexistent gaskets, replace holey H-joint, remount exhaust thing and see what I get.

Could my crappy exhaust be my problem, or am I just fixing another issue unrelated to the original?

(It was def. cool to make a 15 minute drive to a well stocked salvage yard... this will reduce my eBay visits significantly. They've got airboxes, rectifiers, and all sorts of goodies....)



Mr. Brown said:
I'm having the exact same problem on my GS850 right now. Same chamber even. Done the plug/wire/cap swap dance with no luck. Still have to do the petcock bong hit. My plug is very oily and gassy, so that could be a good lead...

You guys rock...:twisted: :-({|=
Click to expand...
 
Mr Brown, generaly the exhaust gaskets are metal rings that go into the head. If you didnt have one, definately a source of problems but i dont think THE problem. Is your bike points or electronic ignition??
 
Yup, no gaskets.

Points... and I haven't touched those yet.

TheCafeKid said:
Mr Brown, generaly the exhaust gaskets are metal rings that go into the head. If you didnt have one, definately a source of problems but i dont think THE problem. Is your bike points or electronic ignition??
Click to expand...
 
I would pull the carbs off, pull the pilots , look at them with light behind it if no light is visible the pilot is clogged. get an old piece of wire strip off the insulation and use the bare wire and run it through the jet use brake clean to get the crap out. then i would do a wet float height test. install carbs, replace plugs on all four, start and synch carbs.
 
mike, just ordered the motion pro adjusting tool, figured it would make life easier. valve job scheduled for sat or sun. I'll post the results.

nick
 
fcchavez said:
I would pull the carbs off, pull the pilots , look at them with light behind it if no light is visible the pilot is clogged. get an old piece of wire strip off the insulation and use the bare wire and run it through the jet use brake clean to get the crap out. then i would do a wet float height test. install carbs, replace plugs on all four, start and synch carbs.
Click to expand...
Clogged pilots would prevent his cylinder from getting gas. He seems to have a flood problem.
 
success...???...ish

success...???...ish

holy crap, so i adjusted the vavles this morning at 5 am... that was fun. fired her up before i went to work and whatdya know #2 was hotter than crap, good right....well now #4 is doing what number two was doing:?.

the only things i changed though were the float height and the valve clearances. I spent a good bit of time on the float height with my new digital calipers :grin: so i am pretty sure thats not the problem.

guess i will pull the valve cover again and double check the valve adjustment tonight or tomarrow night, i had some trouble deciding when i was getting resistance from the valve clearances vs when the feeler gauge was rubbing on some other random part. apparently i should have triple checked.

hopefully that fixes the problem or im gonna think my bike is haunted.


EDIT...scratch that, i swapped plugs on one and four and promptly burned my fingers, oops. gonna go buy some new plugs. I am also wondering if i may have a short in the coils/wires and maybe just moving them around hooked something back up. who knows. I'm planning on some dyna coils and new wires anyhow so no biggy i guess.

thanks for the help everyone. you rock.
thanks for all the advice thusfar and the pm's to see how i was coming.

nick
 
Last edited:
Gremlins don't live long 'round these parts.

Glad you're up and running.
 
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