If anything, maybe go a little larger on the plug gap. But from what people are saying, it's really a mixture problem more then anything. So adjusting the carbs would help maybe? Adjusting the spark plug gap other then what the gap is supposed to be from the factory, can cause ignition system failure due to extra heat that will build up. This is what I'm told. So adjusting the carb and doing a proper adjustments is best.bonjour wrote: So... just to make it clear, make the spark plug gap smaller ?
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Spark question. Is it really happening?
Plug gap.. Fuel mixture.
Hmmmm. Here's an update.
I kept pulling the plugs after cleaning them and they were carbon fouled. The choke made almost no diffrence and nearly killed the motor. Then the Plugs went over the edge! No spark accept the space between head and plug.
Cleaned the plugs. Used carb choke cleaner. Didn't work still fouled after cleaning with carb and choke cleaner. Mind you these are very NEW plugs. After carb choke cleaner, they were still fouled. I had to use a long bristle brush with dawn soap and HOT water then air compressor to dry them out. After this the spark came back in the plugs very nice and blue white. Going off what someone said about carb mix, I had a new idel jet sitting in the box. I compared it to the jet I had a friend clean out. Seemed the jet was larger then a 35 opening from the cleaning maybe. So I dropped in the new idle jet. Double checked the float setting at 26.5 MM. Put in the super clean plugs after double checking them for good spark. Hit the ignition and it fired right up. Hmmm, No choke so it's probably still a little rich. I ran it for a few mintues and the idle started to climb so I adjusted it down and tried to adjust the idel jet. Took it for a little ride and it's not running 100% but it's not fouling out the plugs like it was either. So, I think it was fouling do to extremely rich mixture from reemed out idel jet.
Can anyone tell me what the idel mix screw does? Counter clock wise add more air or fuel? Clock wise subtract air or remove fuel? Is fuel constant it just adds air or subtracts it? I see it goes into the idel jet passage and the one hole from the carb inlet goes right to the screw. So what's the deal here? Does the idel screw al the way in restrict fuel flow and the carberator slide adjusts the air?
Thanks!
Cleaned the plugs. Used carb choke cleaner. Didn't work still fouled after cleaning with carb and choke cleaner. Mind you these are very NEW plugs. After carb choke cleaner, they were still fouled. I had to use a long bristle brush with dawn soap and HOT water then air compressor to dry them out. After this the spark came back in the plugs very nice and blue white. Going off what someone said about carb mix, I had a new idel jet sitting in the box. I compared it to the jet I had a friend clean out. Seemed the jet was larger then a 35 opening from the cleaning maybe. So I dropped in the new idle jet. Double checked the float setting at 26.5 MM. Put in the super clean plugs after double checking them for good spark. Hit the ignition and it fired right up. Hmmm, No choke so it's probably still a little rich. I ran it for a few mintues and the idle started to climb so I adjusted it down and tried to adjust the idel jet. Took it for a little ride and it's not running 100% but it's not fouling out the plugs like it was either. So, I think it was fouling do to extremely rich mixture from reemed out idel jet.
Can anyone tell me what the idel mix screw does? Counter clock wise add more air or fuel? Clock wise subtract air or remove fuel? Is fuel constant it just adds air or subtracts it? I see it goes into the idel jet passage and the one hole from the carb inlet goes right to the screw. So what's the deal here? Does the idel screw al the way in restrict fuel flow and the carberator slide adjusts the air?
Thanks!
Type of Bike is a CA77/CA78
Yeah, it's a PW-22 carberator. On a CA77 1966. It's set right at 26.5 +/- .2 Very Odd Carb for a PW-22. It's not exactly the same as the other PW-22s But it's the same. The choke slide has a little flapper on it. The Fuel inlet nosel comes steright out.brewsky wrote:What bike do you have?
Makes a difference on float height.
Counterclockwise adds air on the idle mix screw.
Re: Spark plug gap.
hate to quote my self, but, plug gap can be and is apparently somewhat common to be off when receiving the plug from the manufacturer.Narly9999 wrote:Ummm, I would think not. Plug gap is a specific gap related to physics of the ignition of the fuel. If the plugs are fouling it's a fuel mixture issue or improper gap. Plugs are properly gapped when purchased. See the section on this forum for tuning. It covers tuning the engine to help prevent plug fouling.
BTW anyone have exact specification on the plug gap? MM/in.? I have searched the form a few times with no results. Seems a common specification question. ??? TANKS AGAIN!