08-25-2011, 08:17 PM #1
Converting a GP1200R to 1300r with Reliability Mods
I am converting a 2000 Yamaha GP 1200r SKI to 1300r with advice obtained from the GH Forum
08-25-2011, 09:14 PM #2
First step was to obtain new 66V Crankshaft from Brandon at Boats.net - he matched best online price with free shipping
Recomendation: request and demand DOUBLE BOX for all crankshaft shipments - my first one arrived with piston rod protruding thru cardboard
refusing the delivery - obviously created an unwanted delay
THEN after 2nd one arrived without issue ; the crank was shipped to Crankworks for T & W
note the weld on the pic
Check out discussion --> http://www.greenhulk.net/forums/show...d-weld-a-crank
I also obtained valuable knowledge from OS Bill's crankshaft purchase thread on this forum
Last edited by dewzee1200; 08-31-2011 at 10:19 AM.
08-25-2011, 09:31 PM #3
- Join Date
- Oct 2006
i did the same type of project a few years ago as my first ski build and i still have the ski, its got 220 hours on the clock now and been a very reliable old girl that spanks new skis silly.
best of luck with the build and please do keep posting pics and updates.
08-25-2011, 11:21 PM #4
Next I sent 3 x 66v rough cylinder cores + PowerValves + 1300R Pro-X pistons to Langcourt Advanced Cylinder Technologies --> http://www.langcourt.com/ for Match Boring
Glen at Langcourt was very helpful and he shipped my components to Lowell Horning at 2 Cycle Porting --> http://2-stroke-porting.com/ for the expert porting work on cylinders - I later shipped the top half of my crankcase for porting as well
Lowell provided a wealth of information to assist with my conversion-- he also performed his piston modifications - Balancing pistons ETC
I opted for the special piston coatings on the piston crowns and the piston skirts -- Lowell handled this with the coating vendor RAM ProLine LLC www.ramproline.com
A special thanks to Lowell for his patience and understanding since I had a lot to learn about 2-cycle performance mods
There is something special about the feeling you get when opening a box like this - Big Boy Christmas !
Last edited by dewzee1200; 08-31-2011 at 07:50 PM.
08-26-2011, 12:09 AM #5
To provide additional airflow into the engine compartment I cut out the black plastic on the right side under the Silver ( 2000 year) colored side fairings on my GPR see Link --> http://www.greenhulk.net/forums/show...airings-on-GPR for other airflow mods
Since I do not like to remove parts when a simple loosening will do -- I loosened the Fairing at the botton - 2 screws and carefully forced it away from HULL and inserted blue shop towel (shown in pic)
NEXT using a screwdriver I pried the BLACK Plastic away from the hull toward the fairing ( this would insure that I did not touch the Hull ) -You can see how I drew my cut line with silver Sharpee marker in the picture
Then using a torch ( away from any fuel - of course - duh) I heated a large kitchen knife and carefully cut the black plastic like butter on the marked line - it only took 3-4 heatings of the knife. I was careful not to touch the hot knife to any other plastic or the hull. This worked to prefection - no filings or cut plastic residue to clean up and when I released the black plastic part -it receded back out of view -- covered by silver fairing - thus covering the cut plastic edge .
08-26-2011, 01:19 PM #6
08-26-2011, 01:31 PM #7
08-26-2011, 01:48 PM #8
After cleaning all thread holes and bathing the cases and cylinders
I have my Crankcase together with 1211 and I will let it sit a few days to cure
I followed the Forum Thread --> GPR Crank installation and crankcase sealing link --> http://www.greenhulk.net/forums/show...nkcase-sealing
Next - I will be setting up PowerValves and adding anodes to my Ported Cylinders
08-26-2011, 02:35 PM #9
08-26-2011, 02:43 PM #10
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