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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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  #791  
Old 16th July 2012
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Quote:
Originally Posted by ~Grind~ View Post
I'm thinking about re-installing the stock lifters into the motor. From what I understand, the JIMS lifters have an extra oil hole in them that may lower the oil pressure. If this is true, this may be contributing to the excessive noise in the valve train. When the motor is cold it's relatively quiet. When the oil gets hot and thin the motor gets pretty noisy. This condition may allow the plungers to bottom out. ? There is only one way to find out. But first I need to lengthen the anti-rotation flats on the stock lifters to accommodate these RS-585 cams.





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I plan on doing the same thing, just based off of bad reviews I've read about JIMS powerglide lifters
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  #792  
Old 16th July 2012
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grind i don't think that the oil hole bleed off is the problem if any thing its a good thing, if you valve get louder when hot you push rods aren't long enough take the covers of the top i know its a lot of work and measure the lift with a dial indicator and make sure you are getting max lift any time you change cams and lifter you should do this.
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  #793  
Old 18th July 2012
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I understand where you are coming from Bob, I just don't see the point when using hydraulic lifters. However, there is a good chance I'm missing something. Anyways, I did remove the rocker covers and rocker boxes. I had already clearanced the pushrod side of the covers and didn't see any sign of abrasion upon inspection of both sides of the covers. I spot checked the gap between the head and the rocker box/gasket with a dial caliper. The dimension on both heads was well within the specs described in the tech article on the Hammer Performance website. I did find another one of my screw-ups on the front rocker box though. I found some slight abrasion where the exhaust valve spring was rubbing the rocker box. I thought I had given the springs plenty of clearance... evidently not. So I got out the die grinder and fixed it. The rear box was fine. I then put it all back together and took it for a 20 mile ride. It was still noisy as ever when I got back so this Friday I'm going to install the modified stock lifters and give them a go.
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  #794  
Old 18th July 2012
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the reason im telling you not to you wont get what you want by going backwards measure your lift on your rocker i think your push rods are to short you must measure your lift to see if your getting wear you need to be it easy and can save time and money measure your lift and times it buy 1.652 should give you your lift if you do not come up with that numer on you cam card your to short or to long and that will make your valve train very noiesy.
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  #795  
Old 18th July 2012
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Ok Bob, I do have the indicators. Where on the rocker is the best place to take the measurement?
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  #796  
Old 18th July 2012
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Hey Scott, how long are your pushrods? Here's the ones I got with my package from Hammer:

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  #797  
Old 18th July 2012
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if you can at the tip of the rocker is the best spot buy if not go wear the ball fits in your rocker and measure from there its going to be a pain to do, but if i could put my hand on any thing i would check this first i think they are a little to short which is good and bad good if its the problem bad you wont have full power yet .
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  #798  
Old 18th July 2012
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i just checked my cams in my lath i have a reading on the intake side and theys are 585 red shift cams my reading was .365 times that buy 1.62= .05913 now on my cam card it sayed i get a advertized .583 lift which id say is pritty close my other intake is the same my exhaust read .360 times 1.62 = 583.2 so if you come up with theys number id say your good to go.

Last edited by Bob s hog; 18th July 2012 at 15:07.. Reason: cuzza
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  #799  
Old 18th July 2012
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all right i just measured all my the numbers look like this

.365
.365
.360
.361
is what iv got for numbers.
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  #800  
Old 18th July 2012
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Ok, Thanks Bob. I will check it out as soon as I get time.


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