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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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  #11  
Old 5th January 2015
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Re check the compression with the throttle plate and slide wide open.
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Old 5th January 2015
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Quote:
Originally Posted by rocketmangb View Post
Re check the compression with the throttle plate and slide wide open.
+1. 120# is anemic. You should have a good 190# to 200#.
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  #13  
Old 6th January 2015
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Ok, performed another compression test. Results showed 125 lbs. I'll do a leak down test tonight. My guess is bad valve seats. I didn't do a valve job with the upgrade, I just cleaned them up the best I could. On average, if I payed a shop to do a valve job and port & polish. What should I expect to pay?
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  #14  
Old 6th January 2015
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Quote:
Originally Posted by wedge View Post
+1. 120# is anemic. You should have a good 190# to 200#.
Another+ on these Guys. N2 wont rob compression and N4's are normally 180+
I think You have fond what you were looking for. Good luck
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Old 6th January 2015
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Did you put the longer pushrods on the exhaust and the shorter ones on the intake?
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  #16  
Old 7th January 2015
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Push rods went in the exact way they came out.
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  #17  
Old 8th January 2015
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Ok, let me throw this one at ya. Someone suggested that they are pretty sure that the problem is my clutch is slipping. To me, the symptoms do sound right for similar effect. But, I'm not sure that's the problem. I didn't have any issues with the clutch before the upgrade, that I noticed. I think I will adjust it just to see if there is any play or slack. But, what's your thoughts on that?
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  #18  
Old 8th January 2015
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Spring plate failure also does act like clutch slipping under load.
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Clutch could be slipping but there is still the issue of 120 psi.
The leak down test you suggested sounds like a good step to verify all is well inside.
You didn't confirm if you held the throttle wide open when you cranked it.

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  #20  
Old 8th January 2015
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I haven't performed the leak down test as of yet. The last compression test, I removed the air cleaner and held open the slide and throttle plate manually. That's when I achieved the 125 p.s.i. reading. A few other sources said the 120-125 should be good for my set up.
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