2002
Yamaha GP1200R
Stage
3 Upgrade... Endurance Style
Check out the nutted and gutted GPR...
In goes the engine...
Test fitting pipes, designing water...
First day at the lake, everything is working
great....
Goal:
January 31, 2003
75 mph on 91 pump gas, with little
or no porpoising in race conditions.
Currently:
70mph/7500rpms in race trim....
TBD:
Triple pipes. hard mounts.
Test TBD:
Skat Trak Swirl
High compression with Adv43, vs.
Stock Compression with Adv60. Temp/RPM/Top speed/accel graph with radar.
Intake...
Stock jetting, and piston wash.
|
MAG |
CENT |
PTO |
| MAIN JET |
117.5 |
117.5 |
117.5 |
| PILOT JET |
95 |
95 |
95 |
| HIGH TURNS |
1 |
1 |
1.25 |
| LOW TURNS |
1.25 |
1.25 |
1.25 |
| NEEDLE SEAT |
1.2 |
1.2 |
1.2 |
| SPRING |
GOLD |
GOLD |
GOLD |
|
LINK
|
LINK
|
LINK
|
Parts: Tau
Ceti 4x2 Flame arrestors with water socks, Stage 3 Carb Settings, provided
by
RPM racing, ProTec
reed stuffers, and ProTec
slotted
t-handles, with Prok atomizers, chokes
removed, and throats cleaned up. Dual gas pickups with 60 jet in return
line.
|
MAG |
CENT |
PTO |
| Main Jet |
135 |
135 |
135 |
| Pilot Jet |
110 |
110 |
110 |
| High Turns |
2 |
2 |
2 |
| Low Turns |
1 |
1 |
1.5 |
| Needle/Seat |
1.5 |
1.5 |
1.5 |
| Spring |
95 |
95 |
95 |
| Return Jet 60 |
2.75psi@idle 6.5psi@7200
|
same |
same |
| Return Jet 70 |
|
same |
same |
| Piston |
 |
 |
 |
| Plugs |
|
|
|
|
|
|
|
Flywheel/Snout Lapping and Radius...
Crankshaft Support...
RPM
crank snout support, Crank Works
indexed/welded/slotted crank, with Flywheel lapped to snout, with new Grade
8 crankshaft bolt, torque to 100 ft lbs..
Cooling...
Parts: R&D 3rd cooling
line setup, with x3 1/2" lines. Stock head cover not modified due to being
too thin to reliably drill/tap...
Total of 7 pissers (stock 5/8" dump,
and x6 pissers).
The cooling outlets are as follows:
-
One head outlet dumps to original hull outlet, using 3/4" water line.
-
One head outlet is tapped to accept NPT fitting. This allowed it to run
a 5/8" water line to the ruis style 3 line cooling to the pipes,
then out 3 pissers.
-
3 NPT 3/8" hose barbs are drill/tapped to the SIDE of the actual head over
each cylinder, then out 3 pissers.
Engine...
Parts: Pro-Tec
Billet Rec-head, 150 PSI domes OR stock domes, with stock head cover, front
cover motor mount cut to clear triple pipe, EGT installed, Crank welded/trued,
Factory
Pipe triple pipes, with Jet Works water restrictors, and Riva
Gas Valves with springs cut by Group-K, and caps grooved around lower edge
to help retain zip ties. Riva Splash Carb Guard, Polished exhaust port.
Electrical...
Parts: Advent
Sport tach with EGT probes , fast response probes, Garmin
GPS 3 with remote 12v, no battery. Advent ignition, Triple Pump gas curve,
Rev Limit 7500, dash mounted electrical switch controlling bilge, egt,
and gps. Riva Battery Relocated
to rear of hull. Using the old battery compartment for storage. Fuel pressure
gauge is mounted where the old bypass switch was, and is installed in the
gas return line before the restrictor jet, using a 5/16" tee, a barbed
fitting, and a rubber gasket for backing material.
Handling...
Goal: Tame the porpoise, without
losing top speed. Endurance is main goal, without losing a lot of turning
ability.
Parts: ProTec
Sponsons, and stock ride plate. R&D
Aquavien Pro2 shoe and grate. Speadfreaks
Nujet 13/19 prop, Yamaha 3 degree XLT pump wedge, and R&D
auto-drop rec nozzle with mechanical trim-tabs.
Bilge Pump Install
I find it AMAZINGLY stupid, that
Yamaha did not include an electric bilge pump, on such a high dollar ski.
Like everything else, it appears to be up to the consumer. Hmmmm. An electronic
bilge should be considered mandatory on all GPRs.
Parts: Rule 500 gpm auto, Riva
Bracket and Rotary switch. Wiring. Looms.
Quick Dump Fueling System...
Parts: Insinkerator flange, 1/8"
anodized aluminum, Red-Head female receiver, two 3" sewer drain rubber
connectors, four hose clamps, 6" 3 inch OD aluminum tubing, J.B. Weld,
twelve wood screws, shop built aluminum housing for receiver, stock storage
bucket cut to fit,
