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Old 05-20-2010, 09:50 PM   #1 (permalink)
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I did a Carb Rebuild on my 86' GL1200, I used Randaaks Kit, & Howard Halasz book.

Boiled out my carbs. , set the floats, Sync'd carbs, and I have a flat spot/hesitation at the lower end of the RPM range.


I pulled the spark plugs, to see how the combustion burn looked. The plugs were all the same.

Insulator was white and clean, tip was white, looks like it is too lean.

How do I richen it up a bit. I thought is was the four screws that had the plugs over them.

Help!

Westgl
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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Old 05-20-2010, 09:56 PM   #2 (permalink)
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As strange as it sounds... the spark plugs are supposed to look very white.
Also... if you took a short trip it isn't enough mileage to get any accurate color on the plugs.

If the hesitation occurs after the bike is fully warmed up (not just warm on the temp gauge but oil is warmed up to operating temperature) you might just need to adjust the slow speed screws. Screwing them out (counterclockwise) will richen the mixture. Try about 1/4 turn at a time.

Are you sure that all cylinders are firing evenly?
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Old 05-20-2010, 10:46 PM   #3 (permalink)
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I warmed up bike to operating temp before leaving the driveway.

I Then rode about 10 Miles under a load, got up to 85 mph.

Before the rebuild I noticed a tan to a gray spark plug tip which should be very normal


Westgl
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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Old 05-20-2010, 11:32 PM   #4 (permalink)
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I think Iam just about done.

I may go to a single or dual carbs.

I have had it, I have these $#@%*^ carbs out 6 times, looking for the problem.

I have gone through countless hours trying to get them to work.

I have had it with those so%- of a &*%@%$# carbs

OK I feel much better now.

I am switching to single or dual carbs.

westgl
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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Old 05-20-2010, 11:45 PM   #5 (permalink)
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try playing with the choke(enricher) if it helps then its running lean.
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Old 05-21-2010, 09:42 AM   #6 (permalink)
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Hi William86,

I have tried using the choke enrichiner, thats another reason why I think it is lean. I put the choke on and it runs much better.

But how do I make it richer.

Thanks Guillermo

westgl
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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Old 05-21-2010, 11:03 AM   #7 (permalink)
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It depends on where you need the richness at. If you need it richer at idle then the air mixture screw will help (actually it will help at above idle too). If you need richer running at half to to full open throttle then you have to change the main jet. Changing the idle jet will also help from idle to half throttle (or 1/4 throttle).

I think part of the reason of the complaints about these bikes being cold blooded is that the idle jet is a bit lean to begin with. They run fine when warm so most folks just wait for them to warm up.
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Old 05-21-2010, 11:41 AM   #8 (permalink)
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About 30 miles and check plugs
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Old 05-21-2010, 12:52 PM   #9 (permalink)
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if you blowed compressed air through all tiny holes then you can be 99% sure carbs are clean.

how many turns out you turned the pilot screws? (those with the plug) the manual recalls to use 2 turns out for the 86 model
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Old 05-21-2010, 06:30 PM   #10 (permalink)
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I set carb. pilot screws at was about two turns.

Any more open and the bike starts running rough, and does not want to rev very well.

But set at two turns it will rev but has a flat spot &hesitation just off idle.

and again the plug tip is white, insulator is white and clean.

Low speed jet appeared to be plugged.

Does anyone know what size drill bit the #40 low speed jet is? I want to verify that, that jet is not partially closed.

Thanks

westgl
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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