Thread: It's alive - GP1200R rebuild
06-09-2011, 11:00 AM #1
It's alive - GP1200R rebuild
My ski is finally back together and in working order. I shredded a rod bearing on the last ride of the season last year (It became the last ride of the year anyway). I decided to put it away for the winter because it didn't make sense to me to fix it and then put it right into storage. So I waited to rebuild this Spring.
All of the credit goes to krispaintballz (and to his girlfriend for putting up with it). He did the build - I just tried to learn something along the way. Kris definitely knows what he's doing.
Here's what was done:
crank rebuild - trued and welded
cylinder redone by Millenium
New PRO-X piston (#1 piston)
put it all back together with new seals and bearings
I had some miscellaneous stuff done as well:
return to stock sound suppression
replace corner rub rails
R&D ride plate
The ride plate install is on hold because one of the bolts is spinning. I'm waiting on new insert brackets.
Once parts were in, Kris moved fast.
Motor was built on Saturday.
It went in on Sunday.
I was riding on Monday. I was able to get 2 hours of break-in done. We got hit by a cold front, so I have to wait until next week finish. It's running better than ever right now, just in time for peak riding in Wisconsin.
06-09-2011, 08:12 PM #2
congrats! I had the same problem last year and am ready to put my motor in as well ( just needs pressure test)
Did you premix the first tank in addition with the oil injection or are you just premix?
06-09-2011, 09:40 PM #3
Thanks and good luck with your build.
I am not pre-mix right now. Yes, extra oil was added to the gas tank for the break in.
I have the HO steering nozzle on the way too. Still have the original plastic one from 2000.
Last edited by griffin55; 06-09-2011 at 09:40 PM. Reason: spelling, spelling, spelling
06-10-2011, 08:03 PM #4
06-13-2011, 10:15 AM #5
I was told "a couple glugs". That's a technical term on the racing circuit.
If you do a unit conversion that's about 1/2 quart to a full tank
06-13-2011, 10:18 AM #6
06-17-2011, 10:48 AM #7
I was able to get out for a while yesterday and almost made it through the first tank.
It was a nice day.
My ride plate insert brackets came in, so those were installed last night. Thanks again Kris!
Here's my stock nozzle and plate. Sorry for the bad pic, but you can see a big silicone glob coming out on the right side (by the drain plug). It looks like the previous owner decided to ignore the spinning bolt and seal it up with silicone to prevent leaks.
After pic with the SHO nozzle and new plate
07-17-2011, 10:16 PM #8
So, I went camping at a resort where I can beach my ski the whole time. Everything felt great on the ski. I got 63 on the GPS.
On the last day while loading up to go home, my idle was low (~500 rpm) and I had to hold the throttle a little too keep it running long enough to get back to the launch. On the trailer it fired up and sounded fine of course.
So, while changing the plugs I did a compression test and I got 30-105-105!!!
Head is coming off. Hopefully, I'll know what's going on in the next day or two. This sucks.
07-26-2011, 05:56 PM #9
07-27-2011, 11:37 AM #10
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Joel22190 in forum Yamaha PWC Performance (2-stroke)Replies: 11Last Post: 08-22-2010, 07:21 AM
By SCW920 in forum Yamaha PWC Performance (2-stroke)Replies: 6Last Post: 06-30-2010, 05:39 AM
By goestooslow in forum Yamaha Old School SkisReplies: 20Last Post: 06-09-2010, 10:01 PM
By jplowman2005 in forum Yamaha PWC Performance (2-stroke)Replies: 68Last Post: 05-14-2010, 10:37 AM
By sandman7793 in forum Yamaha How To & FAQsReplies: 1Last Post: 06-13-2009, 07:38 PM