Slight bog down around 6/7000rpm

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Re: Slight bog down around 6/7000rpm

Postby squirrelman » Thu Feb 07, 2019 7:53 pm

it sure could ! :?
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Re: Slight bog down around 6/7000rpm

Postby Barbie & Skipper » Thu Feb 07, 2019 8:18 pm

With all the fueling problems I've had on both bikes' rebuilds, I hesitate to say anything. :shock:

Bad insulators can cause nightmares. Yours looks like it is probably a major contributor to your problems. When you reinstall the carbs, make sure that everything fits completely and correctly, and is tightened correctly.

Adding a shim is a standard recommendation for a mid-range bog. Because of the folded insulator, I probably would hold off on the shim change until you see if proper carb installation fixes the issue. It's easy enough to do a road test without the plastics.

The main thing is to be methodical and thorough. Pulling the carbs repeatedly gets old fairly quickly, but sometimes it just has to be done. Not so bad unless the bike is your sole means of transportation.

Good luck, and keep us in the loop.
Barbie - 89 VTR250 - 7k+, back on the road after 3 1/2 year vacation
Skipper - 90 VTR250 - 37k+, black & white, two-part project finished 22 years after first parked
Parts bike - 90 VTR250 - 20k+, "maintained" by idiots
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Re: Slight bog down around 6/7000rpm

Postby Vtrinohio » Fri Feb 08, 2019 5:03 pm

Ok so I’ve got the manual and want to adjust the pilot screws. I did remove them and counted the turns in . One was probly a half turn shy of what the book says (2 1/8) the other was probly a half turn past that. You guys got any tips or tricks on adjusting. Would like to be correct. 50 rpm increment tach probly hard to find? Appreciate your all’s help.
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Re: Slight bog down around 6/7000rpm

Postby Vtrinohio » Fri Feb 08, 2019 5:18 pm

Here are a couple pics. When she’s fully operational, I will post all the info on her build. Mark
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BEC37EEB-652D-4018-9A7E-CF539EF7B1A7.jpeg
68184483-2E11-4BFD-9629-EAE9EE54687A.jpeg
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Re: Slight bog down around 6/7000rpm

Postby squirrelman » Fri Feb 08, 2019 6:42 pm

Vtrinohio wrote:Ok so I’ve got the manual and want to adjust the pilot screws. I did remove them and counted the turns in . One was probly a half turn shy of what the book says (2 1/8) the other was probly a half turn past that. You guys got any tips or tricks on adjusting. Would like to be correct. 50 rpm increment tach probly hard to find? Appreciate your all’s help.


with engine at operating temp turn in each mixture screw (one at a time) until that cylinder quits firing, then open screw 1 or 2 turns or open until rpm's stop increasing, then close about 1/2 turn. ;)

the only way to set it scintifikally is using an a/f ratio setup with a probe up-ya-bum and adjusting to whatever your stochastic preference # might be

:geek:
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Re: Slight bog down around 6/7000rpm

Postby Vtrinohio » Fri Feb 08, 2019 9:12 pm

Ok, Thanks
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Re: Slight bog down around 6/7000rpm

Postby Barbie & Skipper » Sat Feb 09, 2019 5:18 pm

I have a HF Centech multimeter w/tach. It works, sort of. The sensitivity is pretty weak, so the readings tend to jump around too much to be real useful. Also, it has settings for 3, 4, 5, 6,& 8 cylinder engines, but not 2 cylinder. Doing the math in your head wouldn't be so bad if the readings were more accurate. It works okay for other stuff, but I wouldn't buy one again just for the tach function.
Barbie - 89 VTR250 - 7k+, back on the road after 3 1/2 year vacation
Skipper - 90 VTR250 - 37k+, black & white, two-part project finished 22 years after first parked
Parts bike - 90 VTR250 - 20k+, "maintained" by idiots
Barbie & Skipper
 
Posts: 79
Joined: Fri Nov 16, 2018 5:12 pm

Re: Slight bog down around 6/7000rpm

Postby squirrelman » Sat Feb 09, 2019 7:25 pm

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Re: Slight bog down around 6/7000rpm

Postby Vtrinohio » Sun Feb 10, 2019 5:20 pm

That’s perfect squirrelman, Thanks
Also, inline fuel filter or no. I had one in it before. Thought that may have been my problem. Not so much now but do you guys think they restrict flow much?
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Re: Slight bog down around 6/7000rpm

Postby Barbie & Skipper » Sun Feb 10, 2019 9:27 pm

I use one of these.

They are cheap insurance if your in-tank fuel sock is missing or damaged.
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Inline fuel filter
Barbie - 89 VTR250 - 7k+, back on the road after 3 1/2 year vacation
Skipper - 90 VTR250 - 37k+, black & white, two-part project finished 22 years after first parked
Parts bike - 90 VTR250 - 20k+, "maintained" by idiots
Barbie & Skipper
 
Posts: 79
Joined: Fri Nov 16, 2018 5:12 pm

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