Force full throttle performance problems

[Sambucca29]

I have a mid 1980's Force 125. Up until this year it has performed fine, however this year it will not run smoothly at full throttle. At idle and up thru about half throttle it seems to run OK. I have changed all fuel, cleaned the fuel screen, and ran gas treatment thru the fuel system. I also have cleaned the plugs (but not replaced), and replaced the fuel line and primer bulb. ANy suggestions? Is there a fuel pump on the motor that might be bad?

 

[norman158]

Re: Force full throttle performance problems

get the manual out and clean the high speed jets in the carbs

 

[12Footer]

Re: Force full throttle performance problems

If the plugs have over 40 hours operating ytime on them, replace them.<br />I would run a compression test also, paying particular attention to the bottom two cylinders.<br />Carbs may be gooed-up as Norman sugjested, or the bowls may have collected water from the fuel system. It's that time of year, and the bowls are where condesate collects.<br />Yes, there is a fuel pump,operated by engine compression. It's a two-swtage diaphram type.Wouldn't hurt to check the fuel pump diaphram also.

 

[walleyehed]

Re: Force full throttle performance problems

Don't miss looking very closely at your prop...you may have a slight bend ora damaged area that CAN cause some funny symptoms above the lower rpm settings.....just a thought

 

[walleyehed]

Re: Force full throttle performance problems

I also would agree with checking fuel pump but you say it's OK through half throttle????<br /> To me that eliminates cleaning carbs because the fuel demand is very high at the point of holeshot, untill you are on the step.<br />Not saying it may not NEED a carb job...that may fix it. I have to agree with the possibility of plugs as well...after long periods of use, they sometimes do build resistance and cause problems also....Good luck!

 

[sony2001]

Re: Force full throttle performance problems

Change plugs and feul pump for a start.

 

[Sambucca29]

Re: Force full throttle performance problems

Thank you folks. Each post is very good info. I will check and replace the items you mentioned. I'll send a post on the status. Thanks gain.