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Message started by wrd17 on 10/29/08 at 11:47:42

Title: air/fuel mix
Post by wrd17 on 10/29/08 at 11:47:42

My bike is running very rough, it takes almost full throttle to get it started, dies when I idle down and lags when given gas. If a bike is running rough in this manner can anyone tell me if it is running to lean or too rich.

Title: Re: air/fuel mix
Post by bill67 on 10/29/08 at 11:54:52

Try some SEAFOAM in the gas see if that don't help,Auto stores and WAlmart carry it.

Title: Re: air/fuel mix
Post by wrd17 on 10/29/08 at 11:56:09

ill try that. ive run a few tanks of gas through it though and the problem persists.

Title: Re: air/fuel mix
Post by EssForty on 10/29/08 at 15:23:30

What year is your bike and how many miles are on it? How long since you checked the air filter and spark plug? Have you removed the brass plug on the idle mixture screw? Did the problem develop suddenly or has it been getting worse over time?

Title: Re: air/fuel mix
Post by Charon on 10/29/08 at 15:56:32

You can waste your money on SeaFoam, or any other additive, if you think it will make you feel better. But it won't make your bike run better. It won't clean your carb, it won't clean your spark plug or your air filter, and it won't improve your love life. You are going to actually have to find and fix the problem instead of attacking it with a magical snake oil.

For a start, remove the fuel line either from the petcock or the carburetor. The fuel line is the larger of the two lines. With the fuel valve in ON or REServe, fuel should not flow. With it in PRIme, fuel should flow (be ready to catch it). Put the petcock back in ON or REServe. Remove the vacuum line. This should be dry inside. Apply vacuum to the petcock. Fuel should flow. Remove the vacuum, flow should stop. If the fuel flow is correct, reattach the lines and move to the carburetor. If it isn't, your problem is the petcock or screen.

Title: Re: air/fuel mix
Post by wrd17 on 10/29/08 at 16:25:12

The bike is an '01 with about 12,000 miles on it. I replaced the spark plug about 3 weeks ago when I had the bike apart to paint. Also had to take the tank off and the petcock seems to be functioning properly. Doesn't send fuel in the on or reserve position but does in prime. The air filter has also been cleaned fairly recently. I have not tried the vacuum line but I will check that.

Title: Re: air/fuel mix
Post by Dj12midnit on 10/29/08 at 17:13:59

0C272E3D20214F0 wrote:

Do you have something to back this up or is it just your opinion?

Title: Re: air/fuel mix
Post by steely on 10/29/08 at 19:24:34

527970637E7F110 wrote:

and it won't improve your love life.

It won't????? I want my money back!!!

Title: Re: air/fuel mix
Post by bill67 on 10/29/08 at 20:07:47

charon when did you use SEAFOAM last,just wondering,Last time I seen it work was 4 days ago ,cleaned up a 4 wheelers carb,the 4 wheeler was bogging,cleared it right up in fifteen minutes,You can also put it in the crankcase,cleans up the valves,try it you'll like it.

Title: Re: air/fuel mix
Post by wrd17 on 10/29/08 at 20:44:47

so i checked all lines around the petcock and everything seems to be functioning properly. any more suggestions?

Title: Re: air/fuel mix
Post by Reelthing on 10/29/08 at 21:53:44

Did you check the vac line that runs from the starboard side of the carb to the back of petc0ck - it should not have any gas in it at all

Title: Re: air/fuel mix
Post by wrd17 on 10/29/08 at 22:12:52

i did check this line and there was not any gas in it. i turned the petcock to prime also and no gas in the line. whats my next step?

Title: Re: air/fuel mix
Post by Reelthing on 10/29/08 at 22:19:01

Given the description, if it were me I'd pull the diaphram/slide out of the carb,check it for holes and clean it - sure doesn't take much dirt, oil or what have you to make it sticky - it has to slide free.

Title: Re: air/fuel mix
Post by Reelthing on 10/29/08 at 22:28:16

7A7F693C3A0D0 wrote:

you know some about this sounds odd - the almost full throttle to get it to start seems odd

how far apart does taken apart mean?

Title: Re: air/fuel mix
Post by dr1445 on 10/30/08 at 03:16:03

i would clean up the idle circuit jets and midrange jets since the high speed range seems operational. if it is the low speed side of the carb you might want to consider an inline filter. if you are going to use carb cleaner do not use it near orings. some might cry foul but i use kerosene and wd40 as a solvents to clean carbs. there more friendly to modern rubber materials.

Title: Re: air/fuel mix
Post by Reelthing on 10/30/08 at 04:32:59

Does sound like the pilot jet isn't doing anything - have you had the carb apart to have a look ?

Title: Re: air/fuel mix
Post by LANCER on 10/30/08 at 08:57:36

2C293F6A6C5B0 wrote:

Your low throttle range (pilot circuit) and possibly the midrange (jet needle/needle jet circuit) are clogged up.
In order to get enough fuel and air into the engine for it to fire has required you to open up the throttle into the high range (main jet circuit), which shows that the low and/or midrange are NOT providing enough fuel &/or air. So soak it if you wish in sea foam or what ever, and then give it a try. If it works good afterward then great, if not, then pull it off the engine and take it down to every screw, jet, washer, o-ring, etc, and clean every single passageway in there. I spend up to several hours if needed to do that. I am working on a carb now and took over an hour to clear just one passage, the one in the small brass tube sticking down into the float bowl and has a hole that is only 0.37mm ID. That passageway goes up to the choke/enricher and is also connected to the pilot circuit so it affects both.

Have you noticed the tiny hole on the intake side of the carb ? It is the same size as the other I mentioned (0.37mm ID) and connects directly to the side of needle jet bore, supplying air into that midrange system. Ever notice the tiny holes on the sides of the needle jet? That is where the incoming air gets through to help control the fuel for the midrange.
Can you imagine how small of a particle of dirt or carbon buildup it would take to clog that up? I just now went to check the carb I am working on and spent 15 minutes clearing this passage ... it was clogged with carbon/dirt... before it was clear enough to blow carb cleaner through it freely.

Point is, every passage is essential for PROPER CARB FUNCTION.

Title: Re: air/fuel mix
Post by bill67 on 10/30/08 at 15:02:56

Sounds to me like the slide is sticking SEAFOAM will fix that.