Join Cyclechaos! Motorcycles Wiki Forum Recent Posts Search Today's Posts Mark Forums Read

Carb question

This is a discussion on Carb question within the Motocross forums, part of the Types of Bikes category; I've got (don't laugh) a 1979 honda xr185. I've had the thing for about 15 years now. It sat for ...

LinkBack Thread Tools
Old 04-30-2006   #1
Junior Member
Join Date: Dec 2008
Posts: 15
Default Carb question

I've got (don't laugh) a 1979 honda xr185. I've had the thing for about 15 years now. It sat for about 5 years while i was in the marines and the carb was varnished pretty bad. I ran it through a solvent tank and put a new rebuild kit in it, so it's pretty much good as new. I got it back on the bike and it started on the 3rd kick, so I was pretty excited. The problem I'm having now is I can't get it to idle right.
I've tried adjusting the mixture, the idle and the needle clip position (which I honestly am not sure where it SHOULD be since I can't find any specs on it) and I'm still having problems. It will stay running, but at a very high rpm. and when i slowly loosen the idle screw it just dies, there's no in between. I'm thinking the mixture is too rich because when i give it gas it has a delay and then revs up really high for a few seconds before dropping back down.
If anyone could even tell me what the result of adjusting the needle clip should be, even that would be a help since I'm just taking a shot in the dark with it and hoping it runs better after i move it.
thanks for your help!
einstein is offline   Reply With Quote
Old 04-30-2006   #2
Junior Member
Join Date: Dec 2008
Posts: 14
Default Carb question

Raising the clip up the needle kind of leans it out at a higher RPM and lowering it richens it. It really doesn't do much if at all at idle. Try with the clip one from the top first, usually that's where they are at. Did the rebuild kit come with new jets and a needle?

Make sure the slide moves freely in the carb so it's not sticking. You might want to check your float level again to see if it's too high.
ridernc is offline   Reply With Quote
Old 05-01-2006   #3
Junior Member
Join Date: Dec 2008
Posts: 14
Default Carb question

I'm no carb expert...but one thing that I ran across was that if you got your float set too high it caused a rich mixture (too low a lean mixture) and a rich mix can tend to run fast and not idle down, or lean out without dying.

Any other signs? Black smoke? Sooty plugs?
Joel T is offline   Reply With Quote
Old 05-02-2006   #4
Junior Member
Join Date: Dec 2008
Posts: 13
Default Carb question

it sounds like your float bowl is gummed up. this can cause you float to stick. most of the time this has more to do with the idle being off than anything else. make sure you have a fresh plug and good spark as well.

i really think it is the float because of the situation you are describing with the engine dying with no middle ground. a flooded float bowl will show the same signs. take off the bottom of the carb and inspect the float to make sure that there are no holes in it. that would cause it to sink to the bottom of the bowl. make sure that the float can move free up and down and make sure that the float bowl can effectively flow into the carb. o i almost forgot make sure that the bleeder hose is attached and not kinked shut.
Marc G is offline   Reply With Quote


carb, question

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
72 Honda CB350f Carb question nutznboltz Honda 0 06-17-2009 02:02 PM
79' KZ650 Carb Question donielle Kawasaki 4 11-27-2006 06:25 AM
Carb Question 78 CB750 ram Motorcycle Repair 9 10-14-2006 02:38 AM
Price Question on Carb Kits?? Zac S Yamaha 3 09-10-2006 09:00 AM
Carb cleaning question hayabusalvr11 Motorcycle Repair 5 03-14-2006 04:08 AM

All times are GMT -5. The time now is 08:20 PM.

Powered by vBulletin®