Revs to High after warmup, Wassup?

[CHRISSER]

I have an 81h That has had some real trouble starting and idling sometimes it's good sometimes it's not.
The latest problem has to do with idle. As soon as it gets up to regular temperature the idle climbs to about 2000-2500 rpm.
I can get it down by choking it or letting the clutch out but it just climbs right back up again.
Could there be a vacum hose running amok somewhere here?

[Snow]

If it comes *down* when choking, that may be a sign of idle/off-idle lean condition. Has it always done this, just started doing this, or are you bringing her back to life?

Personally, I am still going through carb hell and I am hoping that a new set of carb rebuild kits from motorcyclecarbs.com will do the trick, currently I have some K&L parts in my carbs and am not even slightly happy about it.

[beechfront]

AMEN about the K&L kits. Only about 1/4 of the parts in my K&L kits were useful. Pilot Jets were wrong so I bought those new, Idle mixture screws were all different between the kits and out of four only one looked correct - so I used the old ones, and I also had one main needle missing so I also used old stuff there. I personally thought the K&L parts looked to be of lesser quality than what I was taking out anyway. Oh yeah, I also can't get 2 of my carbs to stop leaking now so I figure with everything else that was screwed up it wouldn't surprise me if the float valves were wrong too.

Yes I am very bitter.

[Snow]

The float valve/needles are the only thing K&L left in my carbs at the moment, and I am almost completely sure they are causing me my last bit of grief...

[Dennyz]

They only piece of the K&L kits I purchased several year ago that are still in use is the bowl gasket. $25 per carb for bowl gaskets sucks.

[CHRISSER]

Reply To Snow, Idle Problems

No it hasn't always had this high idle problem. This is just the latest in a series of carb problems. The bike was usually hard to start and would never idle on it's own till it warmed up.
This spring it wouldn't start at all, ( I was lazy in the fall and just treated the fuel instead of draining it and lubricating my cylnders, fuel drained into the crankcase, I lost compression and had to drain the case and lubricate the cylinders to get the bike running.)
Cylinder temps where all over the map a while ago so my mechanical buddy made some adjustments the other day and now we have a high idle problem. I suspect I need to have the carbs syncronised again and may have a broken needle valve.
The bike runs ruff in the low end and doesn't come alive till it hits about 2000 rpms.
Hmmm, I'm begining to think maybe I've answered my own question here.

chriso1@shaw.ca

[strom]

Similar problem... idle is too high, choke helps, but right from cold... don't know what it'll do warm. Which way do I have to turn idle mixture screws to richen the mixture? Screw em in or out?

LP

[cbird]

Unscrew them. You will probably have to put a drop of light oil and let it soak in for a while, and use a very good fitting screwdriver. Be most careful if you screw them back in, which you have to do if you want to set them all 1-1/2 turns out or whatever.

[strom]

Originally posted by cbird
Unscrew them. You will probably have to put a drop of light oil and let it soak in for a while, and use a very good fitting screwdriver. Be most careful if you screw them back in, which you have to do if you want to set them all 1-1/2 turns out or whatever.

Erm... been there, done that... unscrewed em, not quite sure how they work... if they work... theyre screws, springs on the outside, inside they are cone shaped and there seems to be a needle in there. Not quite sure if these are two pieces or one piece.

So I have:
Screw with a spring for washer that has a factory setting 1 1/2 turn-out
If I unscrew this completely I find it's cone shaped on the inside, flat bottom part... small, but flat.
When I had the carbs out, I noticed small needle thingies sticking out in front of the carb that seem to line up with these screws... are the screw and the needle supposed to be 2 different items or one single item, just some jerk broke mine off with doing god-knows-what? And I still don't know the way to make the mixture richer... screw em in or out? Is it correct to assume from cbirds post that I have to unscrew them (makes sense)?

LP

[Geezer]

Re: Revs to High after warmup, Wassup?

I suspect you have an air leak and it's most likely between the manifolds and head. The only fix is to pull the carbs then the manifolds and reseal them. Leaking manifolds is a common problem. You can just use sealer on them but I recommend replacing the gaskets. The gasket slightly reduces the heat transferred to the rubber manifold and will make them last just a little longer.

Geezer

Originally posted by CHRISSER
I have an 81h That has had some real trouble starting and idling sometimes it's good sometimes it's not.
The latest problem has to do with idle. As soon as it gets up to regular temperature the idle climbs to about 2000-2500 rpm.
I can get it down by choking it or letting the clutch out but it just climbs right back up again.
Could there be a vacum hose running amok somewhere here?

[strom]

Found me an answer... http://www.xs11.com/forum/showthread.php?threadid=144

OK, somebody has played with em and f***** em up. How to get em out, how can I get another set?

----------------

OK, found a way to get em out....

http://www.xs11.com/forum/showthread.php?threadid=138

Do I really need a new set?

LP

[Geezer]

I bought the carb kits from Parts & More for my 80 Special. They're gaskets and float valves only but that's all I really needed. I've been completely satisfied with them.

Geezer

Originally posted by Dennyz
They only piece of the K&L kits I purchased several year ago that are still in use is the bowl gasket. $25 per carb for bowl gaskets sucks.

[Ken Talbot]

Strom - if you can't track down some new needles, you can repoint the ones you've got by chucking them in a drill press and holding a fine file to them. Be careful when you extract the broken tips, and you can use them as a pattern for your new points. BTDT.....