Engine rebuild suggestions
Thread Starter
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Cruiser
Joined: Jan 2008
Posts: 163
Likes: 5
Engine rebuild suggestions
Hello all,
I'm looking to replace/rebuild my 1998 evo top end. ie: pistons, cylinder head replacement or rebuild for more power from the stock evo displacement.
It's got 70k+ and is getting slow. I'm looking for more accelaration from the 0 to 85 mph range. Any kits or companies to recommend? I don't want to bore the caes but an oversized cylinder bore would be ok.
I haven't talked to a small indy shop (one guy) I plan to use about it yet...would like more opinions.
I'm looking to replace/rebuild my 1998 evo top end. ie: pistons, cylinder head replacement or rebuild for more power from the stock evo displacement.
It's got 70k+ and is getting slow. I'm looking for more accelaration from the 0 to 85 mph range. Any kits or companies to recommend? I don't want to bore the caes but an oversized cylinder bore would be ok.
I haven't talked to a small indy shop (one guy) I plan to use about it yet...would like more opinions.
Tourer
Joined: Nov 2009
Posts: 296
Likes: 0
Hello all,
I'm looking to replace/rebuild my 1998 evo top end. ie: pistons, cylinder head replacement or rebuild for more power from the stock evo displacement.
It's got 70k+ and is getting slow. I'm looking for more accelaration from the 0 to 85 mph range. Any kits or companies to recommend? I don't want to bore the caes but an oversized cylinder bore would be ok.
I haven't talked to a small indy shop (one guy) I plan to use about it yet...would like more opinions.
I'm looking to replace/rebuild my 1998 evo top end. ie: pistons, cylinder head replacement or rebuild for more power from the stock evo displacement.
It's got 70k+ and is getting slow. I'm looking for more accelaration from the 0 to 85 mph range. Any kits or companies to recommend? I don't want to bore the caes but an oversized cylinder bore would be ok.
I haven't talked to a small indy shop (one guy) I plan to use about it yet...would like more opinions.
i would rebuild the whole thing while your at it , someone can correct me if i am wrong but doing the top end only might give you problems on the bottom end .
Road Captain
Joined: Jun 2007
Posts: 716
Likes: 24
1) Rebuild the entire engine at 70k miles. Replace only whats worn, and then install a nice camshaft, new oil pump, breather gear, etc.
2) Then, convert the top-end to a Twin Cam...also called a Fatso.
http://daytonabeachcycles.com/Fatso-Information.html
2) Then, convert the top-end to a Twin Cam...also called a Fatso.
http://daytonabeachcycles.com/Fatso-Information.html
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
As Revl33 suggested, if you rebuild the top end you will probably blow the bottom end shortly after. A few years ago a friend of mine did just that.
You can bore the cases out a little to get a bigger cylinder in, alternatively you can stroke it, as I did, to 89". You may find you can both bore and stroke it.
But you would be far better off talking to a tuning shop for recommendations, such as some of the HDF sponsors. These guys can work wonders with motors these days and probably offer you more improved performance than you thought possible.
You can bore the cases out a little to get a bigger cylinder in, alternatively you can stroke it, as I did, to 89". You may find you can both bore and stroke it.
But you would be far better off talking to a tuning shop for recommendations, such as some of the HDF sponsors. These guys can work wonders with motors these days and probably offer you more improved performance than you thought possible.
Road Warrior
Joined: Nov 2006
Posts: 1,699
Likes: 2
From: Deltona, FL
You can rebuild the top end with no problems. I put .010" over Keith Black 8.5:1 pistons in my 88 FXR and had no problems whatsoever from the motor. Port and polish the heads, put in an EV27 or EV3 cam and adjustable pushrods, Mikuni HSR42 with a K&N filter. You'll be happy.
Oh yeah, don't forget to convert to a single-fire ignition and coil.
The only drawback I had was an occasional hard start. I'd have to back off the starter to let the motor release compression and then hit it again sometimes. You could probably avoid that with compression releases or a more powerful starter, but mine is still working for my Brother-in-Law to whom I sold the FXR.
Oh yeah, don't forget to convert to a single-fire ignition and coil.
The only drawback I had was an occasional hard start. I'd have to back off the starter to let the motor release compression and then hit it again sometimes. You could probably avoid that with compression releases or a more powerful starter, but mine is still working for my Brother-in-Law to whom I sold the FXR.
Tourer
Joined: Nov 2009
Posts: 296
Likes: 0
You can rebuild the top end with no problems. I put .010" over Keith Black 8.5:1 pistons in my 88 FXR and had no problems whatsoever from the motor. Port and polish the heads, put in an EV27 or EV3 cam and adjustable pushrods, Mikuni HSR42 with a K&N filter. You'll be happy.
Oh yeah, don't forget to convert to a single-fire ignition and coil.
The only drawback I had was an occasional hard start. I'd have to back off the starter to let the motor release compression and then hit it again sometimes. You could probably avoid that with compression releases or a more powerful starter, but mine is still working for my Brother-in-Law to whom I sold the FXR.
Oh yeah, don't forget to convert to a single-fire ignition and coil.
The only drawback I had was an occasional hard start. I'd have to back off the starter to let the motor release compression and then hit it again sometimes. You could probably avoid that with compression releases or a more powerful starter, but mine is still working for my Brother-in-Law to whom I sold the FXR.
so how many miles did you have on it when you did that he has 70,000 and talking about a whole top end which is entirely different,
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Thread Starter
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Cruiser
Joined: Jan 2008
Posts: 163
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OK, I got it. I'll go with the whole thing... now, any New Englanders out there to give recommendations of indy shops in Pref. ME/NH? I had one guy in mind but maybe I should talk to other shops about a full rebuild.
Thanks all.
Thanks all.
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