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2004 BF40A limiter on fuel/air screw

Hi,
I'm curious as to why you want to adjust the pilot screws? Are you having an idling issue?

I ask because, if the carbs were properly synchronized, the pilot screws shouldn't need adjustment.

The limiter caps are glued on and can be carefully removed without damaging the screw heads by applying some heat. It's tricky though. I have a special, very small heat gun for doing that but it doesn't always go smoothly.

If you snap off the heads of the screws, it will be difficult to turn or remove them for replacement.
 
jgmo said:
Hi,
I'm curious as to why you want to adjust the pilot screws? Are you having an idling issue?

I ask because, if the carbs were properly synchronized, the pilot screws shouldn't need adjustment.

The limiter caps are glued on and can be carefully removed without damaging the screw heads by applying some heat. It's tricky though. I have a special, very small heat gun for doing that but it doesn't always go smoothly.

If you snap off the heads of the screws, it will be difficult to turn or remove them for replacement.
Click to expand...
Good morning, thank-you for the quick reply. No. 1 cylinder is running way too rich. The carbs were taken off and cleaned. The last 2 or 3 years the #1 (or top) cylinder spark plug and exhaust port are black. Do you think I'm barking up the wrong tree with wanting to tune the carb? All in all the motor runs great...
 
Well, I think I would want to know some other things before digging back into the carbs again.

Have you swapped plugs around to see if the problem changes or follows the plug?

Do you have a spark tester? Harbor Freight has a really cheap one that works well and can give you some useful info.

For this I would do a compression test and, if it hasn't been done in awhile, I would check/adjust the valve clearances.

Did you do the carb work yourself?
 
jgmo said:
Well, I think I would want to know some other things before digging back into the carbs again.

Have you swapped plugs around to see if the problem changes or follows the plug?

Do you have a spark tester? Harbor Freight has a really cheap one that works well and can give you some useful info.

For this I would do a compression test and, if it hasn't been done in awhile, I would check/adjust the valve clearances.

Did you do the carb work yourself?
Click to expand...
New plug in #1 same results, turns black. Do not have a spark tester. The carb work was done by someone else.
 
I think that you would benefit by knowing what the engine compression readings are and how the three cylinders compare to one another.
I honestly don't think that the plug fouling is entirely with the idle circuit. I could be wrong but a compression test is what I recommend.

Good luck.
 
jgmo said:
I think that you would benefit by knowing what the engine compression readings are and how the three cylinders compare to one another.
I honestly don't think that the plug fouling is entirely with the idle circuit. I could be wrong but a compression test is what I recommend.

Good luck.
Click to expand...
Thank-you I appreciate the help...
 
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