I searched, I read, I broke out the tools
12-06-2004, 06:35 PM
#1
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MotoGP
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Join Date: Dec 2004
Location: South Texas
Posts: 2,553
I searched, I read, I broke out the tools
Ok, my "new" used 98 had one significant running issue. It had bad stumbles, slight surging, and carb spitbacks while running at low speeds between 2000-3000 rpm. No problems rolling through it rapidly.
Well looking around the net, including this site, revealed two cheap fixes (my favorite kind):
TPS output settings and shimming the carb needles.
I also tried a carb sync first (path of least resistance). My TPS setting (did you get that memo about those TPS reports?) was WAY OFF at .850 ohms. But by far the biggest bang for the buck was the $1.99 radio shack washer trick of shimming the carb needles 20 thousands.
I heartily recommend trying these before spending $$$ for a jet kit if you're having rideability issues. If you're looking for HP, I don't think these help in that department and a jet kit is the way to go.
My 2cents ($1.99 actually)
Doug
Well looking around the net, including this site, revealed two cheap fixes (my favorite kind):
TPS output settings and shimming the carb needles.
I also tried a carb sync first (path of least resistance). My TPS setting (did you get that memo about those TPS reports?) was WAY OFF at .850 ohms. But by far the biggest bang for the buck was the $1.99 radio shack washer trick of shimming the carb needles 20 thousands.
I heartily recommend trying these before spending $$$ for a jet kit if you're having rideability issues. If you're looking for HP, I don't think these help in that department and a jet kit is the way to go.
My 2cents ($1.99 actually)
Doug
12-07-2004, 06:26 PM
#3
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MotoGP
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Join Date: Dec 2004
Location: South Texas
Posts: 2,553
Re: I searched, I read, I broke out the tools
Yeah, my TPS was so far out of whack (tech term) that I couldn't get it back to normal range with the built-in adjustment slots. I found that I could push out the brass ringlets in the screw holes to give me enough leeway without resorting to drilling or other methods.
Doug.
Doug.
12-21-2004, 08:54 PM
#5
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MotoGP
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Join Date: Dec 2004
Location: South Texas
Posts: 2,553
Re: I searched, I read, I broke out the tools
Here's a follow up to this mod after about 300 miles.
My bike began running very ragged after running it very hard through the gears which included hitting the rev limiter pretty hard in second gear. It felt like it was running out of gas and after firing through the exhaust on closed throttle. The engine itself sounded fine and even idled OK.
It turned out the front carb slide was stuck open. I followed the instructions on the website a little too literally and used the recommend diaelectric grease which, it turns out, dries out pretty quickly in gas environment.
Cleaned and lubed with honda silicon spray and all is well. FYI.
My bike began running very ragged after running it very hard through the gears which included hitting the rev limiter pretty hard in second gear. It felt like it was running out of gas and after firing through the exhaust on closed throttle. The engine itself sounded fine and even idled OK.
It turned out the front carb slide was stuck open. I followed the instructions on the website a little too literally and used the recommend diaelectric grease which, it turns out, dries out pretty quickly in gas environment.
Cleaned and lubed with honda silicon spray and all is well. FYI.
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