BannedCR500Riders.com

Right on guys! Good info.
I have always used Millineum to plate my cyl's. But these cyl's were not iron lined. I will post what I find out.......

Thanks again

I have a nikisil plated cylinder on my cr500 hillclimb bike. I bored it out to 91mm, then the guy who ported it sent it to(i think) US chrome, i had it coated on the stock steel sleeve and set the piston clearence to .005 on a wiesco piston. i have about 30 hours run time on it so far with no problems.

4Z wrote:Right on guys! Good info.
I have always used Millineum to plate my cyl's. But these cyl's were not iron lined. I will post what I find out.......

Thanks again

Those extra ports look way bigger than a GSS cylinder I've seen.

So the ring end gaps don't hang up on the ports?

Ok thats the exhaust side with no bridge.

Thats a bitchen looking cyl

lewisclan wrote:Thats a bitchen looking cyl

You would not like how fast it will wear your top end out compared to stock and it is for peak HP.

Slow old Fart wrote:

lewisclan wrote:Thats a bitchen looking cyl

You would not like how fast it will wear your top end out compared to stock and it is for peak HP.

I am building a Methnol bike I would like to run a cyl like that on.
I have a few hotrod hillclimbers. I like peak HP.

OOps sorry guys, the pic is just to show a non-sleeved, nik'd cyl. The motor it belongs on is not a 500. Sorrrrrry 'bout dat.

Here is the before porting pic:

4Z wrote:OOps sorry guys, the pic is just to show a non-sleeved, nik'd cyl. The motor it belongs on is not a 500. Sorrrrrry 'bout dat.

Here is the before porting pic:

I dident think it was but its a bitchen looken cyl nice work

I thought about copying that from a 250 when I was doing all of my port work, but unfortunatelly, there are water jackets in the way...
Although, I imagine (especially with an AL sleave) you could drill big holes where those extra exhaust ports are and put an auminum tube in there and wled it, then shape it to flow nicely and have a nice sized port window... there I go again thinking about pulling my jug and experimenting...
I think maybe my spare 2.00mm jug should get some experimentation

Well Dan, if Teem Trouble would take one of these sled jugs (85mm bore X 70 stroke) and copy the port design, merge it with the OE hundy, whip up a couple protos on his Mazak. I can have Doug Ruth clean up the ports like the one pictured. You know, Union Bay Racing in Seattle did billet cyls for sleds and quads for years. And with all these world class, record setting motors, Doug did all the porting and R&D.
We as a group could make this happen!!!!!

MIKE?!?!?!? How is your Solid Works skills??

That there is a decompression hole. Kinda like the scallops in 500's

No shit?? Doesnt look like it would do much decompressing!!

M.F.D.B. wrote:No shit?? Doesnt look like it would do much decompressing!!

Yeah, for the big 1200 triple motors they don't amount to much. I "think" they help the average rider for the stock 800 twins. Regardess, we have plugged them before and didn't notice anything on the 12 hundy at all.
Scallops do a better job IMHO.

M.F.D.B. wrote:No shit?? Doesnt look like it would do much decompressing!!

I gotta agree, it looks like some kind of fuk up to me.

How it works is that it is a straight shot right into the exhaust valve guide area that lets it bleed into the pipe. Some are funky shaped as they end up looking like a after thought by the factory. It is a non issue in reality. Like the pic of the "before" cyl is a different jug, the hole is different on that cyl. Friggin Polaris anyway!!!!

britincali wrote:

M.F.D.B. wrote:No shit?? Doesnt look like it would do much decompressing!!

I gotta agree, it looks like some kind of fuk up to me.

M.F.D.B. wrote:

britincali wrote:

M.F.D.B. wrote:No shit?? Doesnt look like it would do much decompressing!!

I gotta agree, it looks like some kind of fuk up to me.

LOL

Here is a another fuk up, the exhaust valve doesn't fit in the port now!!

OOPS! you don't need no stnkin' power valve!!!

dannygraves wrote:OOPS! you don't need no stnkin' power valve!!!

I call them "lack-of-power valves"...

I had Max Power coat mine. Was about 2 years ago. Coated the sleeve, piston, and head.
I've used coated pistons for years. Swain Tech did a number of snowmobile and bike pistons for me. Excellent results. One of those things I believe once you try it you never go without. Coatings are dirt cheap. You can find enough change under your couch cushions to coat a piston. In my experience and many others once you drop a coated piston into your jug you can pretty much forget about it.

Now...I chose Max Power on this last rebuild because I was interested in coating the entire top end. Less friction, more power, lower running temps...blah blah blah I don't know about that marketing stuff. I'm sure it's there but how can a rider like us tell a difference? We can't. What I can tell you is it's quite. The quietest motor I've ever heard. It doesn't make a mechanical whisper. 2 years running now it's as quiet as the day I put it together. I may even argue it does in fact run cooler. But that would simply be based on what I've heard on these forums. Seems the Florida summer heat is rough out in the sticks. I rode the slowest, tightest trails this 500 has ever seen this summer and lost no water.
Upon taking it apart this summer there was no measurable change in piston to cylinder wall clearance with my shop tools. I'm not surprised. If the Apticote stuff is as good as Swain Tech's, I don't suspect I'll have to replace anything for many years. My next top end job might be in 2015.

Mick, very interesting. Checked out their web site, pretty cool.
Going to give them a call and ask some questions. I like trying new things and this is a perfect chance. good info, thanks

http://www.maxpower-engines.com/mpcplate.htm

I just got off the phone with them looks like I will be shipping off 2 cyl & pistions to get coated. I am still waiting on some wiseco pistions I orderd to come in. thanks for the info Mick

hey called them up and they said they don't plate the sleeve. am I missing something?

The Max Power process originated in aerospace and is proven in Indy car and F-1 racing. The Max Power process uses a proprietary formulation of ceramic composite named APTICOTE 2000.

Max Power's process is computer controlled and offers many different advantages over competitors. Every cylinder is diamond finished, the port edges are polished, the gasket surfaces are lapped on a surface plate, and the cylinder is thermal shock tested for plating adhesion. Max Power's competitors don't have the machine tools or the technical expertise to offer optional services like exhaust valve service and cylinder head reconditioning. Max Power offers these services for a reasonable price, plus Max Power carries a stock of exhaust valve parts and gaskets. Max Power guarantees your reconditioned cylinder with a limited warranty for parts and labor. Max Power offers a quick turn-around mail-order service to dealers, home based mechanics, and racers.


BASIC CYLINDER RECONDITIONING for MOTORCYCLE, ATV, SNOWMOBILES AND KARTS
This service covers the cylinder plating repair of single bores from 39 to 105mm. We also check the flatness of the gasket surfaces, and we have the capability to turn the cylinder on a lathe in order to clean up deep gouges. This is a basic service so please remove the exhaust valves. Costs start at $200.