83 CR480

Brett Campbell
Edited Date/Time 10/29/2015 6:44pm
Wiseco offers two piston kits for std. bore. One is for a 79mm stroke and the other is for 76mm stroke, which is stock. All of the single pistons offered are listed for 79mm stroke. Does that mean that none of the single pistons will work on a stock stroke?
|
TTperra
Profile picture for user TTperra
Posts
311
Joined
9/15/2015
Location
SE
TTperra 10/29/2015 10:26am
10/29/2015 10:26am
It will work, its the same piston in the kits
871M08900 for std bore
76mm stroke is 480
79mm is 500
TTperra
Profile picture for user TTperra
Posts
311
Joined
9/15/2015
Location
SE
TTperra 10/29/2015 11:17am
10/29/2015 11:17am
Maby gaskets are included in the kit?
Those will be different.
But to be sure i would ask wiseco

The Shop

See All »
newmann
Profile picture for user newmann
Posts
24444
Joined
4/1/2008
Location
US
newmann 10/29/2015 11:48am
10/29/2015 11:48am
Just had someone ask me if I knew anyone looking for a Fox Twin Clicker shock for a 83 CR. Good condition, needs a fresh rebuild.
TTperra
Profile picture for user TTperra
Posts
311
Joined
9/15/2015
Location
SE
TTperra 10/29/2015 11:56am
10/29/2015 11:56am
Got öhlins on mine.
Dont know anything about twin clickers, are they good? Or is it just a cool vintage damper?
Brett Campbell 10/29/2015 12:39pm
10/29/2015 12:39pm
This is the reply I got from Wiseco.

Dear Sir,
Our new part # 871 Series is updated from the old 636 & 554 series and fit "ALL" 480 & 500 CR's models. Difference is in the gaskets for the PK kit. Yes, there is a difference in stroke and deck height of stock cylinder on 480 & 500.
Again, our new part fits "ALL" bore and different stroke CR 480 /500 model years.
Thank you and Good Luck
newmann
Profile picture for user newmann
Posts
24444
Joined
4/1/2008
Location
US
newmann 10/29/2015 2:16pm
10/29/2015 2:16pm
Thank you and Good Luck? Yikes....Laughing

They offer the same piston for 79 - 84 CR125's. 79 CR125 has a very small intake cutaway, 80 slightly larger and 81 and up a much larger cutaway. I'm no 2 stroke port guru, but what effect will a huge piston cutaway have on an engine designed for a small cutaway?

Piston on the left is what Wiseco offers. Piston on the right is stock height 1980 CR125 cutaway made from a 74-78 CR125 OEM piston, center in the pic. Took a bit off the skirt and cut the intake side to match.



Here is a stock 79. Notice the stock single ring? Wiseco has dual ring.

TTperra
Profile picture for user TTperra
Posts
311
Joined
9/15/2015
Location
SE
TTperra 10/29/2015 2:48pm
10/29/2015 2:48pm
It looks like there is a differense in dome shape and hight.
Think that will make more change then cutaway.. but im no pro
450exc115
Profile picture for user 450exc115
Posts
664
Joined
11/6/2014
Location
Hebron, CT US
450exc115 10/29/2015 6:44pm
10/29/2015 6:44pm
My gut tells me not much as the window is there to expose the intake port on the intake stroke. The small cut out just must of had a small intake port while later years had that T shaped one.

I always check to make sure the piston skirt doesn't block the intake port during the intake stroke to ensure you get full charge.

Post a reply to: 83 CR480