Engine hesitation
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The forums are a place for open discussion of karting topics. Please respect the opinions of others. No name calling, abuse, bashing etc. of any sort will be tolerated and offending posts will be removed and offenders sanctioned at the discretion of the webmaster or the executive. All posted materials, text, etc. become the property of the CKRC and may be displayed or removed at the discretion of the CKRC.
Engine hesitation
I've noticed in the last couple of test and tune sessions that I have an engine misfire or hesitation coming out of several corners. Could I be needing to make a float adjustment or needle adjustment? Could the mixture be a little too lean? Or rich? Any pointers would be appreciated. Thanks Ernie.
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- Posts: 650
- Joined: Wed Jul 09, 2008 1:57 pm
- First Name: Mark
- Last Name: Hillier
- City/Town: Calgary
Re: Engine hesitation
Are you hitting the rev-limiter (~6100 RPM) ?
If so, that's supposed to happen. If it's just for a second or so at a couple of spots right before you nail the binders, you're geared perfectly. Just feather the throttle a tad when you hit the limiter.
Otherwise, drop a tooth on your rear sprocket and you'll lose a few hundred RPM and come off the limiter.
If so, that's supposed to happen. If it's just for a second or so at a couple of spots right before you nail the binders, you're geared perfectly. Just feather the throttle a tad when you hit the limiter.
Otherwise, drop a tooth on your rear sprocket and you'll lose a few hundred RPM and come off the limiter.
Mark Hillier #44 VLR Senior, Shifter
Re: Engine hesitation
Yes I am hitting the rev-limiter but only on the longest straight way. ( At about the start line, cw direction).
The sputter and hesitation is occurring coming out of corner 7 and 11 as I'm accelerating into the climb up to corners 8 and 12.
Of course I do acknowledge that weighing in well over the Briggs Sr. Heavy weight minimum does come with it's disadvantages!
Thanks for the tips!
The sputter and hesitation is occurring coming out of corner 7 and 11 as I'm accelerating into the climb up to corners 8 and 12.
Of course I do acknowledge that weighing in well over the Briggs Sr. Heavy weight minimum does come with it's disadvantages!
Thanks for the tips!
- John Kwong
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Re: Engine hesitation
Hi Ernie,
The floats do go out of adjustment over time. 22mm is the optimum float height from the deck to the top of the float with the carb upside down. You also want to make sure that the little pilot jets are also not plugged with a speck of dirt. Always run a fuel filter and replace it once a season.
Here is the tuning guide pdf. http://www.briggsandstratton.com/engine ... .pdf?la=en
Here is another guide: http://www.blastkarting.com/4-stroke-carb-tuning/
John K
The floats do go out of adjustment over time. 22mm is the optimum float height from the deck to the top of the float with the carb upside down. You also want to make sure that the little pilot jets are also not plugged with a speck of dirt. Always run a fuel filter and replace it once a season.
Here is the tuning guide pdf. http://www.briggsandstratton.com/engine ... .pdf?la=en
Here is another guide: http://www.blastkarting.com/4-stroke-carb-tuning/
John K
Re: Engine hesitation
Thanks John. I will check it out.
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- First Name: jason
- Last Name: thorell
- City/Town: calgary
Re: Engine hesitation
I had set my float, or so I though. But, as soon as I fired it up, it spit fuel out the overflow. There was a single grain of sand in the float needle slide bore. Have always been told, all it takes is a single grain of sand, but have never actually seen it happen.