Thread: Cylinder plating
05-11-2007, 08:32 PM #1
I have a set of ported 1200R cylinders I got recently and I am ready to install and noticed a little plating missing around the exhaust port. I need some opinions on this Thanks Bill
Last edited by OsideBill; 05-11-2007 at 08:51 PM.
05-11-2007, 08:48 PM #2
Bill, this doesnt look that bad as long as there is nothing for the ring to get hung on. If it does affect compression which it may not, but if it does you will have a little more freespin on this cylinder which will rob some lowend power but will add to topend rpms. imo
05-11-2007, 09:00 PM #3
The first two pictures are the same cylinder the third picture is another. the other cylinder I have is fine. These are ported by speedworks I am wondering if porting plated cylinders causes the delamination around the edges of the chamfers. in my opinion porting should be done prior to plating. I am just not sure I want to put these in my ski or not. They were running when pulled by previous owner who went big bore.
05-11-2007, 11:26 PM #4
That normally occurs while porting the cylinder. If your bit is not
clean and you are not cutting at the correct speed the chipping
can occur. It's not as bad on the oem plating, it can happen more
often on the aftermarket plating. It can even happen when you are decking your cylinders. So caution must be taken. On the big
bores some bore the cylinder, then they port and then send back to
have plated. It's a lot longer process but works the best. The answer
to your question could go either way, since the previous owner was running them, you could probably get by but the chiping could get worse
and cause major problems. You could raise the exhaust port height
to clean up the problem. But then you height might be to high for
a single pipe setup. If it was a triple pipe setup I don't think there would be any problems from adding 1 to 2mm from a stock height cylinder.
05-11-2007, 11:45 PM #5
If it were mine I would use a very fine stone on a dremmel and very LIGHTLY and carefully chamfer it.Most would say nay,but if it ran before I would touch it up and run it again.You have a lot of good carma in your favor too Thats my 2 cents I'm cheap and easy Best wishes Bill
05-11-2007, 11:52 PM #6
Bill I have known you a long time now. You are a perfectionist. Are you really going to install those on your gpr like that?
Remember one thing a great man once said.
"The gpr platform demands perfection. Anything alse and it will exact its toll in $$$ and time wrenching"
Hell, I have run 800 cylinders on my tripple piped gpr with hardly any nic left at all. It siezed a lot. Thats me, I just didnt care! I wanted to race come hell or high water. Your a busy guy Bill. Dont make a mistake that is going to cost you more precious time!
05-12-2007, 12:07 AM #7
Listen to Joe but you knew that before you asked the question.
I know its killing you having to wait longer and the expense.
Looks like you could get them replated or open them up and run pipes.
Its a lot of money to take a chance on.
05-12-2007, 12:13 AM #8
Ben Thank you my questions were answered regarding proper process.
And since the exhaust ports are already raised I do not feel comfortable going higher.
H204YOU I was considering feathering the edge with a stone I have done this in certain plated injection molding tools at work where delamination was an issue.
Joe what can I say when you are right you are right.
I have three options it seems
1. Band aid it feather plating to reduce the edge and hope ring does not catch it.
2. send it out for re-nick 2 weeks turn around $175 each
3. Ask the seller to take it back.
Lots to contemplate Thanks to all for the posts
05-12-2007, 12:16 AM #9
Send them back to the seller. You can punch out any $100.00 used gpr cylinder. Its not worth the hassle.
05-12-2007, 12:23 AM #10
Funny thing was that I cleaned and inspected these really good. I never noticed this until tonight the light was right and caught the difference in shine. The seller was kind enough to send these to me to check out first, I did and told him they were fine after initial cleaning and inspection so I sent him the money. I would not feel right going back now. This ones on me.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By RX951 in forum Yamaha How To & FAQsReplies: 6Last Post: 09-21-2015, 04:15 PM
By SAVAGEXP in forum Kawasaki ClassifiedsReplies: 6Last Post: 10-01-2008, 07:31 AM
By blu4ce in forum Yamaha PWC Performance (2-stroke)Replies: 5Last Post: 07-27-2008, 08:16 PM
By smartalec_87 in forum Kawasaki Open DiscussionReplies: 6Last Post: 06-09-2008, 07:07 PM
By SLOANMAN in forum Yamaha PWC Performance (2-stroke)Replies: 1Last Post: 12-25-2007, 09:00 AM