Evo rebuild
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Tourer
Joined: Mar 2009
Posts: 323
Likes: 137
From: North Carolina
Evo rebuild
I have an 87 electraglide with 62k miles, front cylinder smoking a bit and rear cylinder base gasket leak. I'm tearing it down now to bore, new pistons, rings, and valve job. I'd also like a little more torque so putting in an ev27 cam, lifters and push rods. I'm not building a race bike just looking for a little more than stock. The budget doesn't allow for head porting, flowing, and shaving, just a valve job. I was wondering if I should put higher comp pistons in. I heard the ev27 does better with a little more comp. I was looking at 9.5:1 and 10:1 pistons but didn't know if I should go that route or just new stock comp pistons. I also just picked up an unmolested cv carb and k&n filter to rejet and replace my old butterfly carb. I've had a dyna ignition and screamin eagle mufflers on it. Any input?
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Spend the extra money and get some Total Seal Gapless rings. They are good for more torque and HP over stock type rings and they last longer with less leak down. There are lots of guys that do "street porting", Basically they clean up the bowl under the valve and match the ports for about $250+. This will make a noticeable difference especially with the cam and more compression. Hope this helps, if you have any questions please feel free to contact me by E-Mail.
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
I'd stick with lower compression an EV-13 cam The CV carb This is probably the first top end job ? use james metal base gaskets have the cylinder bases honed You should be good to go to 100,000 miles plus
Thread Starter
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Tourer
Joined: Mar 2009
Posts: 323
Likes: 137
From: North Carolina
thanks. Yes this is the bikes first top end job. I'll look for the gapless rings and check local for street porting. I read the ev13 gives more mid and upper range, is that true? looking for more low and mid. So that will run good with stock compression?
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Tourer
Joined: Mar 2009
Posts: 323
Likes: 137
From: North Carolina
My original list includes ev27, 9.5:1 KB pistons, Rowe black melonite valves, lifters, pushrods, valve guides & seals, cylinder studs, and breather gear all through Jireh under $600. I'm doing the tear down and build up myself. Going to have heads done and cylinders bored for me.
Stellar HDF Member
Joined: May 2005
Posts: 2,137
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From:
EV13 provides more power at lower rpm than the EV27. Look at the intake closing number. The higher it is, the higher rpm you need to make power. Both will work with stock compression. If you're really just wanting a little more power than stock, higher compression is not necessary
I think Cometic gaskets are the best right now. When I did my base gaskets, I did rings and head gaskets too, with James gaskets. After 75K, the rear base gasket is again starting to seep, so it didn't last much longer than the OEM. But both Cometic and James have new designs in the last few years, so read up on both and make your own decision on which sounds the best.
A nice mod to the CV, if it's a stock TC88, is to leave the jets stock and change the idle jet needle to the '88-'89 Sportster 1200 needle. Here are a couple of websites that cover CV carb mods.
http://www.nightrider.com/biketech/hd_cv_mods.htm
http://www.ridermagazine.com/output.cfm?id=217441
You mention you have a K&N filter. If you mean you are still using the stock air cleaner housing, you will be better off to get an aftermarket housing that is designed to improve flow into the carb. If the SE is still available for Evos, that's a good one and probably the cheapest. K&N also makes the complete air cleaner and filter set.
Your SE mufflers should work fine.
I think Cometic gaskets are the best right now. When I did my base gaskets, I did rings and head gaskets too, with James gaskets. After 75K, the rear base gasket is again starting to seep, so it didn't last much longer than the OEM. But both Cometic and James have new designs in the last few years, so read up on both and make your own decision on which sounds the best.
A nice mod to the CV, if it's a stock TC88, is to leave the jets stock and change the idle jet needle to the '88-'89 Sportster 1200 needle. Here are a couple of websites that cover CV carb mods.
http://www.nightrider.com/biketech/hd_cv_mods.htm
http://www.ridermagazine.com/output.cfm?id=217441
You mention you have a K&N filter. If you mean you are still using the stock air cleaner housing, you will be better off to get an aftermarket housing that is designed to improve flow into the carb. If the SE is still available for Evos, that's a good one and probably the cheapest. K&N also makes the complete air cleaner and filter set.
Your SE mufflers should work fine.
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Tourer
Joined: Mar 2009
Posts: 323
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From: North Carolina
Thanks for the info on the cams I didn't know that. I read the nightrider article on cv carbs before but not the other one. the two articles raises the question I've heard before, Do you drill the slide or not? I did get an aftermarket housing along with the K&N filter, so that's ready to go.
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Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Do not drill the slide out or go to a lighter spring. Those tricks are OK for the track, but your mileage will suffer on the street. Just put the Sportster needle in and start with the jets that came in your carb. Read the plugs and make changes accordingly.
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Tourer
Joined: Mar 2009
Posts: 323
Likes: 137
From: North Carolina
that's what I thought. That's why I found a carb that was still stock and just figured on rejetting. But from what you say and the one article says I may only have the change the needle and leave the jets.