Replacement cylinder with stock heads.
Thread Starter
|
6th Gear
Joined: Mar 2010
Posts: 11
Likes: 0
From: Norway
Replacement cylinder with stock heads.
I´m going to replace my 1997 EVO stock 80 cu cylinders and pistons.
Do I have to replace it with stock cylinders or could I go for some bigger cylinders without doing some work with the heads or crank...If so, how much could I raise the cylinder volume..?
Thanks.
Do I have to replace it with stock cylinders or could I go for some bigger cylinders without doing some work with the heads or crank...If so, how much could I raise the cylinder volume..?
Thanks.
Last edited by Qonrad; May 27, 2011 at 05:54 AM.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
For the most part, larger cylinders means you will have to split the cases and bore out the spigot holes to get any worthwhile gain in engine displacement. just bore out the stock cylinders enough to straighten out the bore. Then new pistons and rings. The old cylinders have been "heat cycled and will be more stable than new ones. Hope this helps.
Thread Starter
|
6th Gear
Joined: Mar 2010
Posts: 11
Likes: 0
From: Norway
Thanks for usefull replies.
I se the point using the old cylinders and bore them.
But here in Norway it would be more expensive to bore, than order a new stock cylinders & piston kit incl. all the engine gaskets from the US.
I also se the issues about the old cylinders is "settled"... but do you guys mean there is a risk to put new cylinders on, and are we talking lekkage and other troubles..?
I se the point using the old cylinders and bore them.
But here in Norway it would be more expensive to bore, than order a new stock cylinders & piston kit incl. all the engine gaskets from the US.
I also se the issues about the old cylinders is "settled"... but do you guys mean there is a risk to put new cylinders on, and are we talking lekkage and other troubles..?
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Sometimes new cylinders will take a set after being heat cycled a few times and be slightly out of round. This is not a big deal on an average street bike, however if you are looking for the best bang for your buck then the re-bore is the way to go.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Thanks for usefull replies.
I se the point using the old cylinders and bore them.
But here in Norway it would be more expensive to bore, than order a new stock cylinders & piston kit incl. all the engine gaskets from the US.
I also se the issues about the old cylinders is "settled"... but do you guys mean there is a risk to put new cylinders on, and are we talking lekkage and other troubles..?
I se the point using the old cylinders and bore them.
But here in Norway it would be more expensive to bore, than order a new stock cylinders & piston kit incl. all the engine gaskets from the US.
I also se the issues about the old cylinders is "settled"... but do you guys mean there is a risk to put new cylinders on, and are we talking lekkage and other troubles..?
I suggest you look further afield, such as Zodiac (in Holland). They have at least a dozen agents in Norway and import many well known brands from the USA. I am sure at least one of them can rebore your cylinders, even if you have to send them through the post!
To increase the engine size of an Evo is expensive compared with a twincam. Increasing cylinder diameter requires machining the crankcases, as John has already stated. An alternative (which I have done) is to stroke to 89ci, but that also requires dismantling the engine. You can improve performance of a stock size evo significantly by careful tuning, matching cams, compression ratio and head work. I am sure at least one of those Zodiac dealers can help you!
Thread Starter
|
6th Gear
Joined: Mar 2010
Posts: 11
Likes: 0
From: Norway
Thanks for following up.
I really don´t need more power, I have andrews 27 cam and screaming eagle ignition. But the idea came up if I could choose a number bigger cylinder & pistons since I have to go all the way down to the block.
The reason is that it´s has slightly started to burn oil.
I went to the local dealer to get a opinion. They concluded that is either the valve seals, guides or rings. If they should take the job and maybe rebore, it would cost about USD 3000-3700,-
So I decided it would be a nice winterjob. Since I would do this properly I thought it was a good idea to replace both cylinders and pistons since I find a cylinder & pistons kit all the gaskets to the price of USD 1055,- incl. Norwegian taxes and shipping.
In Norway labour cost approx. USD 200,- per hour + the material.
But in the end I have been convinced by you guys that the safest thing to do is rebore my old cylinders with fresh pistons.
I really don´t need more power, I have andrews 27 cam and screaming eagle ignition. But the idea came up if I could choose a number bigger cylinder & pistons since I have to go all the way down to the block.
The reason is that it´s has slightly started to burn oil.
I went to the local dealer to get a opinion. They concluded that is either the valve seals, guides or rings. If they should take the job and maybe rebore, it would cost about USD 3000-3700,-
So I decided it would be a nice winterjob. Since I would do this properly I thought it was a good idea to replace both cylinders and pistons since I find a cylinder & pistons kit all the gaskets to the price of USD 1055,- incl. Norwegian taxes and shipping.
In Norway labour cost approx. USD 200,- per hour + the material.
But in the end I have been convinced by you guys that the safest thing to do is rebore my old cylinders with fresh pistons.
Last edited by Qonrad; May 31, 2011 at 06:38 AM.
Trending Topics
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Thanks for following up.
I really don´t need more power, I have andrews 27 cam and screaming eagle ignition. But the idea came up if I could choose a number bigger cylinder & pistons since I have to go all the way down to the block.
The reason is that it´s has slightly started to burn oil.
I went to the local dealer to get a opinion. They concluded that is either the valve seals, guides or rings. If they should take the job and maybe rebore, it would cost about USD 3000-3700,-
So I decided it would be a nice winterjob. Since I would do this properly I thought it was a good idea to replace both cylinders and pistons since I find a cylinder & pistons kit all the gaskets to the price of USD 1055,- incl. Norwegian taxes and shipping.
In Norway labour cost approx. USD 200,- per hour + the material.
But in the end I have been convinced by you guys that the safest thing to do is rebore my old cylinders with fresh pistons.
I really don´t need more power, I have andrews 27 cam and screaming eagle ignition. But the idea came up if I could choose a number bigger cylinder & pistons since I have to go all the way down to the block.
The reason is that it´s has slightly started to burn oil.
I went to the local dealer to get a opinion. They concluded that is either the valve seals, guides or rings. If they should take the job and maybe rebore, it would cost about USD 3000-3700,-
So I decided it would be a nice winterjob. Since I would do this properly I thought it was a good idea to replace both cylinders and pistons since I find a cylinder & pistons kit all the gaskets to the price of USD 1055,- incl. Norwegian taxes and shipping.
In Norway labour cost approx. USD 200,- per hour + the material.
But in the end I have been convinced by you guys that the safest thing to do is rebore my old cylinders with fresh pistons.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
$200 per hour??? Can I get a work visa???? What is the cost of living in Norway???? I am going to print this out and when my customers complain about $50 per hour, I will show it to them.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
