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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #41  
Old 3 Weeks Ago
Four Speed Four Speed is offline
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Sounds like you have plenty of oil pressure! I have the upgraded oil tank where the oil return is at the bottom of the tank rather than half way up, so I don't have that issue. What oil pump did you end up using Duker?
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  #42  
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How do you block off the bypass? I just replaced the spring and ball, but still feel the flow is low at idle (i idle at 1150 to 1200rpm)

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  #43  
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Originally Posted by cycowrencher View Post
How do you block off the bypass? I just replaced the spring and ball, but still feel the flow is low at idle (i idle at 1150 to 1200rpm)

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Used a 2 inch spring. It's never going to open
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  #44  
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Originally Posted by Four Speed View Post
Sounds like you have plenty of oil pressure! I have the upgraded oil tank where the oil return is at the bottom of the tank rather than half way up, so I don't have that issue. What oil pump did you end up using Duker?
For now the stock.
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  #45  
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Quote:
Originally Posted by cycowrencher View Post
How do you block off the bypass? I just replaced the spring and ball, but still feel the flow is low at idle (i idle at 1150 to 1200rpm)

Sent from my LGLS992 using Tapatalk
You cant.

Late 5 speeds dont have a bypass,I think starting in '92

The spring and ball are really just a check valve that opens at around 6 PSI and also serves as an anti-drainback.

Have you up-dated the oil pump ?
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  #46  
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Quote:
Originally Posted by rocketmangb View Post
You cant.

Late 5 speeds dont have a bypass,I think starting in '92

The spring and ball are really just a check valve that opens at around 6 PSI and also serves as an anti-drainback.

Have you up-dated the oil pump ?
Yes. It has a brand new buell pump in it.

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  #47  
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Unless you can find a Pro Flow pump you did all you can do !

Might try some different oil filters ?
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  #48  
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shanneba shanneba is offline
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Quote:
Originally Posted by rocketmangb View Post
You cant.

Late 5 speeds dont have a bypass,I think starting in '92

The spring and ball are really just a check valve that opens at around 6 PSI and also serves as an anti-drainback.

Have you up-dated the oil pump ?
Except the XR1200Xs, they have an oil bypass that opens at 50 psi.
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  #49  
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Whole different animal !
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  #50  
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Quote:
Originally Posted by rocketmangb View Post
You cant.

Late 5 speeds dont have a bypass,I think starting in '92

The spring and ball are really just a check valve that opens at around 6 PSI and also serves as an anti-drainback.

Have you up-dated the oil pump ?
I'm going to update the pump this winter to the 07 buell.
As to the bypass it opened on me due to a week spring.
When it does that you have 0 oil pressure and you roast your engine. The oil light will never come on either.
You may be confused. The 86-90 has a separate bypass in the oil filter mount. That's what I blocked
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