CCP and Leak Down Test Results
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
CCP and Leak Down Test Results
Hi Guys, I picked up a '95 FXD about 6 weeks ago that wasn't ridden much lately or maintained for the last several years and the owner was highly motivated to sell since he's a snowbird and kept the bike in a shed when he goes back home (I'm in Florida). Allegedly the bike has around 48,000 miles but the speedo doesn't work and I sent that up to Pa. to hopefully get fixed. Anyway, I won't bore you with all the details but I got the bike running pretty good to the point where I could take it all apart and know that at one point, it ran like it should. I have many plans dancing around in my head for this bike including possibly some engine work so I took the gas tank off and then the exhaust system and I was ready to cut the pushrods when I thought I should do some tests 1st to get before and after results of the engine build, while seeing if anything is wrong with this engine, even though it seems to run good. So I check the CCP (WOT) and the front is 115 and the rear is 120. So much for my seat of the pants ''running good" diagnosis. I shoot some oil into the cylinders and the CCP jumps up to 150 each which indicates a probable ring issue. Just to verify, I hook up the leakdown tester and get 58% loss in the rear and 65% in the front which ironically, the gauge says is "moderate'. I had the dipstick out and the air cleaner off to listen for any hissing sounds and sure enough, there was hissing coming out of the oil tank which indicates rings and/or scored cylinders? I thought perhaps I might put off the engine part of this reno until next year if I got good test results but that's not to be. What I wanted to verify with you guys is - the fact that the gas tank and mufflers were off the bike, that wouldn't affect the CCP or LD test would it? I don't see why it would but just want to verify. Thanks in advance.
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
Thanks for the response hot rod. I have several different combos in mind but the problem is finding a machine shop that I can trust without waiting a month to get my heads and cylinders back. Hillside has done work for me previously but theyre busier than a dog in heat, same with Cycle Rama in Tampa.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,090
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From: Poolville
There WFOLarry, in Virginia, http://www.larrysmotorcyclemachine.com/
Marco@rocketridecycles.com He's in Florida..
Both very trustable...
Marco@rocketridecycles.com He's in Florida..
Both very trustable...
Thread Starter
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
Thanks for the info hotrod. When I cut the pushrods, does each piston have to be TDC on the compression (or exhaust) stroke? And if it does, why not just take off the rocker covers - without them warping, remove the rockers, rocker box etc and pull the push rods out from above without cutting them?
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,090
Likes: 7,610
From: Poolville
It's always good to relieve as much valve spring pressure you can before you cut them so yeah bringing each one up the TDC, it's the wise thing to do. Or you can just disassemble the top ending reuse the pushrods, depends on what you're going to do..
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
Yeah, that's the hard part. I know what Id like to do but time and $$$ may get in the way. Thanks for all the info.
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Seasoned HDF Member
Joined: May 2008
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From: South Carolina
If the bike is running good and not using too much oil, no need to tear into the top end.
The leakdown test is not the best way to judge an engines health, unless you know what the leakdown was when the engine was fresh.
Don`t cut the pushrods if you are going to disassemble the top end...
You don`t need adjustable push rods.
The leakdown test is not the best way to judge an engines health, unless you know what the leakdown was when the engine was fresh.
Don`t cut the pushrods if you are going to disassemble the top end...
You don`t need adjustable push rods.
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Thread Starter
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
If the bike is running good and not using too much oil, no need to tear into the top end.
The leakdown test is not the best way to judge an engines health, unless you know what the leakdown was when the engine was fresh.
Don`t cut the pushrods if you are going to disassemble the top end...
You don`t need adjustable push rods.
The leakdown test is not the best way to judge an engines health, unless you know what the leakdown was when the engine was fresh.
Don`t cut the pushrods if you are going to disassemble the top end...
You don`t need adjustable push rods.
Thread Starter
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Road Captain
Joined: Mar 2008
Posts: 712
Likes: 55
From: Punta Gorda, Florida
Cylinder looks good to my untrained, naked eye. Sure looks fit enough to use with new pistons after honing and truing the bases.
I guess these pistons look ok and based on the CCP and LD tests, I could probably just put new rings in and call it a day. But what fun would that be?
These look pretty good actually.