carbs

[mtirillo]

If I spray carb cleaner in the carbs when the engine is running to try to flush anything out could I do harm? The motor runs fine till it hits about 5000 rpms then falls flat on its face? 140 Johnson 2 stroke motor.

 

[Cannondale]

Re: carbs

You'll get better results with SeaFoam spray cleaner.

 

[rockyrude]

Re: carbs

need more info on the motor, year , model etc.

 

[Bondo]

Re: carbs

If I spray carb cleaner in the carbs when the engine is running to try to flush anything out could I do harm? The motor runs fine till it hits about 5000 rpms then falls flat on its face? 140 Johnson 2 stroke motor.View attachment 74176

Ayuh,... Welcome Aboard,...
Yes,.. Doin' that could cause harm, 'n won't do a danm thing to Help your Problem...

If by chance it's a Carb Problem, it's in the Inside that needs cleanin',...
They need to be taken apart,.. Rebuilt to do that....

Hi-rpm miss could be the fuel tank, the lines, the filter, or the pump....
Diagnosis keeps ya from rebuildin' the wrong things 1st....

 

[Bifflefan]

Re: carbs

Probably not going to help.
You need to figure out what is causing the issue.
Lack of fuel, lack of spark. Maybe its the plugs, wires or something like that.
Possible that something is in a carb jet, or the fuel pump is not keeping up.
Just spraying cleaner in the carb will just lean out the mix and cause some damage to the engine.

 

[mtirillo]

Re: carbs

Thanks guys, I will check with all the fuel lines and go from there..

 

[Chris1956]

Re: carbs

That will make the carb throats really shine....

 

[robert graham]

Re: carbs

Sounds to me like your motor is running great, but the fuel delivery system just can't keep up with the required flow at 5000RPM's, maybe a bad or weak fuel pump, a restriction somewhere in the fuel system, maybe a partially plugged filter screen, etc. Start at the tank pick-up, fittings, primer bulb, fuel filter, fuel pump, etc., just work your way up to the carbs. Good Luck!