Excessive Engine Pressure
Road Warrior
Joined: Dec 2007
Posts: 1,666
Likes: 3
From: Styxville
If it is the rotary breather, make sure it is timed right with the dots lined up etc.
If it is the reed breather, make sure it is not possible to fit it in back to front.
If it is the reed breather, make sure it is not possible to fit it in back to front.
Thread Starter
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1st Gear
Joined: May 2014
Posts: 5
Likes: 0
From: Belleville il
Update: When I started this project, I took cylinders to a local machine shop and requested that cylinders be bored out .010. The shop recommended using Wiseco piston that they will order. As agreed, the shop ordered new Wiseco pistons and bored and honed cylinders. However, due to cylinders condition, the shop claimed they had to bore-out cylinders to .020. Afterwards, I re-assembled engine and started encountering numerous oil leakage problems.
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Update: When I started this project, I took cylinders to a local machine shop and requested that cylinders be bored out .010. The shop recommended using Wiseco piston that they will order. As agreed, the shop ordered new Wiseco pistons and bored and honed cylinders. However, due to cylinders condition, the shop claimed they had to bore-out cylinders to .020. Afterwards, I re-assembled engine and started encountering numerous oil leakage problems.
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Why not just get some 20 over pistons?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
If cylinders are already bored at 20 over and aren't all scratched up then I don't see a problem.
How many miles do you have on current configuration?
The best thing you can do IMO is open her up and look at the cylinders and see what condition they are in before just buying new ones.
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
Update: When I started this project, I took cylinders to a local machine shop and requested that cylinders be bored out .010. The shop recommended using Wiseco piston that they will order. As agreed, the shop ordered new Wiseco pistons and bored and honed cylinders. However, due to cylinders condition, the shop claimed they had to bore-out cylinders to .020. Afterwards, I re-assembled engine and started encountering numerous oil leakage problems.
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
I would take them to a machine shop that knows how to bore a evo cylinders
Stellar HDF Member
Joined: Jul 2011
Posts: 2,583
Likes: 115
From: Boston, MA
that is messed up you cant bore a cylinder without piston in hand. to get the clearance right and ill bet they didn't use torque plates. and if they bored .020 with .010 pistons they would rattle bad.
I would take them to a machine shop that knows how to bore a evo cylinders
I would take them to a machine shop that knows how to bore a evo cylinders
Intermediate
Joined: May 2014
Posts: 37
Likes: 0
From: Modesto California
I just went through exactly the same thing. I found oil all down the side of my bike in alarming amounts.
I took it all back apart again and the only thing I could find wrong was that I had the 2 longer bolts in the cam chest backwards.
I have no idea why but it doesn't leak anymore.
I took it all back apart again and the only thing I could find wrong was that I had the 2 longer bolts in the cam chest backwards.
I have no idea why but it doesn't leak anymore.
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
The longer one goes to the rear.
#15 on OEM manual page 3-43 (at least in mine).
I hope this helps.
Road Master
Joined: Sep 2013
Posts: 1,054
Likes: 441
From: Tejas
Update: When I started this project, I took cylinders to a local machine shop and requested that cylinders be bored out .010. The shop recommended using Wiseco piston that they will order. As agreed, the shop ordered new Wiseco pistons and bored and honed cylinders. However, due to cylinders condition, the shop claimed they had to bore-out cylinders to .020. Afterwards, I re-assembled engine and started encountering numerous oil leakage problems.
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
Today, I contacted Wiseco and explained my problem. From this conversion, I discovered the following facts: The Wiseco pistons the shop ordered are part # 4724P1, which are fitted for cylinders bored over .010. The correct pistons for cylinders bored over .020 should be 4724P2. Therefore, it appears these cylinders are over bored for these pistons.
At this point, I am thinking of discarding cylinders and start shopping for a new a cylinder kit. Any recommendations?
While you are waiting, I'd go revisit the original shop and get my money back for the original work done showing them the wrong pistons bought for it. Hopefully for you, they will balk and you can school them a bit..
LOL..
Griz