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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 13th August 2012
nrs_nate nrs_nate is offline
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Question sprayed carb cleaner on manifold seals,motor changed rpm?

My damn intake manifold seals keep going bad...I sprayed carb cleaner on the seal part while the engine was running and the motor bogged down on each seal, thus meaning the seals are bad? Also my plugs are too white for me, they were nice and grey. Is there any tricks to have longer lasting manifold seals?
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Old 13th August 2012
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Originally Posted by nrs_nate View Post
My damn intake manifold seals keep going bad...I sprayed carb cleaner on the seal part while the engine was running and the motor bogged down on each seal, thus meaning the seals are bad? Also my plugs are too white for me, they were nice and grey. Is there any tricks to have longer lasting manifold seals?
1. What year bike, how many miles, how many seals?
2. How do you install them?
3. Leaking at head or carb?
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Old 13th August 2012
nrs_nate nrs_nate is offline
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1998 1200 custom,installed them with air cleaner back plate on, to make sure they line up..Never tried the the carb seal, just the head seals,
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Old 13th August 2012
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1998 1200 custom,installed them with air cleaner back plate on, to make sure they line up..Never tried the the carb seal, just the head seals,
I would expect better success installing at the heads, first.
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Old 13th August 2012
nrs_nate nrs_nate is offline
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I seem to be replacing these quite a bit, how long -should- they last when correctly installed?
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Old 13th August 2012
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hi maybe you are running to lean and its getting to hot and causing the seals to go bad thats my guess they should last a long time if you are running the right mixture .
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Old 13th August 2012
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just ordered a seal kit, I'll be checking the plugs!!, mabey go with a bigger pilot jet
Although i read the plugs before the seals went bad and they were nice and greyish brown, So I might not be running lean, bike didn't spit or cough even blipping the throttle and there was no dexcel pop
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Old 13th August 2012
John Harper John Harper is offline
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My manifold to head seals are originals, almost 22 years old. Should last a while I guess.

John
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Old 14th August 2012
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Quote:
Originally Posted by nrs_nate View Post
My damn intake manifold seals keep going bad...I sprayed carb cleaner on the seal part while the engine was running and the motor bogged down on each seal, thus meaning the seals are bad? Also my plugs are too white for me, they were nice and grey. Is there any tricks to have longer lasting manifold seals?
Nate, when you're doing that test, it's very easy to get fooled. With most spray cans, if you press the spray can button all the way, I can about guarantee you that it'll get sucked into the air cleaner and change the rpm that way. You have to just barely spray around the seals to make sure you're testing them only.

Does the motor exhibit any other symptoms of an intake leak, hanging at a higher rpm before falling to idle?
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  #10  
Old 14th August 2012
nrs_nate nrs_nate is offline
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The bike runs pretty good as it sits. But i'll try to just barley shoot it on the head seal and only there
Thanks
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