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Cylinders 2 and 4 are dead cold!

  • Thread starter Thread starter RiceCooker
  • Start date Start date
I was writing when you beat me to the post. It seems you are getting on the right track. New carburetor and boot O-rings are required (cycleorings.com), new boots always a good idea. You'll need a new valve cover gasket and tool to depress the buckets. A good compression reading might be enough to go on with some of the other things you need to do, but will never tell you if the valves are about to get too tight and will affect carburetor sync. Z1 Enterprises are a good source for gaskets, shims, etc.
 
good deal OldVet66. I think I saw a a mixture screw for another mikuni B34 which I couldnt find anywhere else but at Z1 long time ago, if I recall.
Didn't know they also have shims. I'll check those out. What I've done to get the shims out before is stick a zip tie under it through the sparkplug hole might /might not be possible in this one. way cooler if I can use a specialty tool :D
I'll give more details on this bike when I get there.

BigD_83 Shims it is then.
As I posted early I'm checking out a compression test tool from Pepboys tonite.
Engine it's stock 8 valve, bikes complete, all original unmolested (not even serviced i think lol ) low miles for an 83. 8 K miles
I dont know why the've called it the uGLy Im starting to like those lines.

This is the first time I follow a forum.... literally. You guys rock so far loving this forum.
I know, RiceCoooker sounds overseas am I right? but that's just for the sake of this project :D since it's a you know, import bike. Lil racist? maybe.
A friend calls Rice boilers whatever is not a harley but anyways, Im in New Jersey btw. cheers.
 
RiceCooker said:
.
A friend calls Rice boilers whatever is not a harley but anyways, Im in New Jersey btw. cheers.
Click to expand...
I've heard that a lot, My Harley friends called them rice burners until they tried to race one, then they made their bikes louder so maybe you wouldn't notice them getting wiped slick. Not that you can't make a Harley straight line fast, but that costs more than a Busa, noise is cheaper:D
 
# 2 Run! till I took the carbs apart again...


Ok, crapy compression tester was missing the oring on the sparkplug adapter. Also there was quite play fitting it so this numbers are not accurate. I might do another test If I get another tester.

although this readings are way too low I think... they were constant.

dry test:
cyl 1: 60 psi
cyl 2: 55 psi
cyl 3: 40 psi
cyl 4: 40 psi

wet test
cyl 1: 62 psi
cyl 2: 58 psi
cyl 3: 45 psi
cyl 4: 45 psi

I put some wd-40 around the sparkplug adapter in the tester and I could see the air/oil spray out between the engine and the tester so this wasn't an accurate test. Also tried to compensate the missing oring with sparplug washers but I got same readings.


barnbiketom said:
Spray a small shot of ether or even wd-40 into the airbox or sync ports when bike is idling. if 2 and 4 pick up.. you have plugged carbs. easy
Click to expand...

I forgot the basics here uh? seems like they got clogged. they did pick up while idling when sprayed.
I got #2 unclogged just by spraying carb cleaner while running. I checked after engine cooled down so only # 4 was clogged. #2 Ran!

Not taking any chances now... I took them all apart again...and got a new chem dip can, I'm dipping the carbs again. I'm dipping one at a time for a full 24 hrs and all the brass' been dipped since I started (Tuesday). Should be done by tomorrow nite!

Also will put a gas filter, although I didn't see any particles in the bowls, not a bad idea (since they got clogged)
 
Those are extremely low numbers, and I don't have much confidence in them. The missing o-ring could certainly be playing a part there.

Also, did you have the throttle wide open when you were testing? Low numbers like that could be accounted for by not being able to draw in air to compress.
 
Did you do the compression numbers with the throttle held open? If not you'll get VERY low readings.
 
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