B
BSA
Guest
Hmmm definitely sounds like an air leak. If you can get it running try spraying carb cleaner (or WD40) around the carb clamp, intake gasket, base gasket etc. See if the rpm drops for a few seconds.
BSA
BSA
Bike idling fast with new plug?
- Thread starter Elmstreetmotorized
- Start date
2stroketech
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- 11:24 PM
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- May 31, 2009
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- 28
If you can not get your engine to run to do the simple air leak test then you will have to do a preasure leak down test. This will intail blocking the intake and exhaust off and putting 15 pounds of vacume to it and see if it holds. If it does not hold for 2 minutes then you need to fill the engine with 18 pounds of air and using a spray bottle with soapy water find the leak.
Elmstreetmotorized
New Member
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- Apr 25, 2009
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Well I got her runing this morning. Must have been flooded last night.
Just to be sure I went over everything last night. I checked the washer on the needle clip. The throttle is freely moving. Went over carb cleaned and reattached with some rtv to make sure it didnt leak. Pulled the head off checked the gasket. Went over the intake gasket and the spark plug. When she started today I tried to ride down the block she would run normal for a sec then got kinda jumpy like it maybe misfired. It didnt bog. then all the sudden it started to rev almost as if I was giving in full throttle. I had to use the choke t kill it because the switch didnt work. took it home got it running and was about 5 feet away when it started to rev up on its own again.
Could it be a bad cdi or magneto? It is a cheap china kit. It ran fine though till I switched the plug.
Just to be sure I went over everything last night. I checked the washer on the needle clip. The throttle is freely moving. Went over carb cleaned and reattached with some rtv to make sure it didnt leak. Pulled the head off checked the gasket. Went over the intake gasket and the spark plug. When she started today I tried to ride down the block she would run normal for a sec then got kinda jumpy like it maybe misfired. It didnt bog. then all the sudden it started to rev almost as if I was giving in full throttle. I had to use the choke t kill it because the switch didnt work. took it home got it running and was about 5 feet away when it started to rev up on its own again.
Could it be a bad cdi or magneto? It is a cheap china kit. It ran fine though till I switched the plug.
Junster
Member
When you put the carb slide back in you did check to make sure you lined up the slot with the nub inside right? Then with it together pull up on the cable housing where it goes into the top of the carb. Feel the slide go up and down. Make sure when it's at the bottom that there's at least an 1/8" of slack in the cable before you feel the slide come up. Most of the carbs that come packed with the cable already attached have a kink in the cable right where it goes into the carb. You need to bend the cable straight with your fingers. It's not the ignition or it wouldn't run. If your using the original plug wire did you take the knob thing off the top of the new plug?
B
BSA
Guest
Look it is fairly obvious that you have an air leak. We've already explained how you search for one (using spray can of WD40/ carb cleaner? spray it around the intake gasket, carb clamp etc) Spray it while it's running, when you have sprayed over the air leak the rpm's wil settle down.
I'd bet you a million dollars it's an air leak. Had so many on my bikes over the last 2 years, there very common. Just a fact of life your gonna get them everynow and then.
BSA
I'd bet you a million dollars it's an air leak. Had so many on my bikes over the last 2 years, there very common. Just a fact of life your gonna get them everynow and then.
BSA
Mountainman
Active Member
Elmstreetmotorized
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Sorry for the delay in posting. I havent had a chance to do much with it the last few days because of rain.
I would like to say that I have 2 bikes. I have, and know how to look for air leaks. I had and fixed one on my other bike before. Also I have checked now on this motor 3 times since this problem arose. None of the times did the bike slow in rpms or rev in rpm when spraying the areas. I checked every possible area where 2 parts connect. all intakes and such. I have removed, cleaned and sealed the intake and carb 3 times now. I have removed the plug, checked the gap and resealed. I replaced with the old plug. I have checked the throttle from top to bottom and the needle and clip as well. I went over all electrical connections and even disconnected the kill switch. So I have taken each suggestion and tried them. I appreciate the help but I am not a 12 year old boy. I am an adult who is mechanically incline and does all my own maint. on all of the vehicles I have ever owned from my 59 studebaker to my new cars.
I will keep all questions to myself from here on out. Thank you again and goodbye.
I would like to say that I have 2 bikes. I have, and know how to look for air leaks. I had and fixed one on my other bike before. Also I have checked now on this motor 3 times since this problem arose. None of the times did the bike slow in rpms or rev in rpm when spraying the areas. I checked every possible area where 2 parts connect. all intakes and such. I have removed, cleaned and sealed the intake and carb 3 times now. I have removed the plug, checked the gap and resealed. I replaced with the old plug. I have checked the throttle from top to bottom and the needle and clip as well. I went over all electrical connections and even disconnected the kill switch. So I have taken each suggestion and tried them. I appreciate the help but I am not a 12 year old boy. I am an adult who is mechanically incline and does all my own maint. on all of the vehicles I have ever owned from my 59 studebaker to my new cars.
I will keep all questions to myself from here on out. Thank you again and goodbye.
eastwoodo4
Member
does it have a fuel mixture screw on it?maybe its just too lean.i believe that can make it idle up.
Molotov256
Member
I'm curious what solution you arrive at, Elm - I just ordered a new plug, and I wanna know what I'm up against before I put it in.
