GPR\XLT Carb Upgrade\ Accelerator pump removal

[T0MMY B0NES]

Is this possible on a 2003 XLT 800? Or just the GP's?

[Jeroen]

Firt time poster, used greenhulk a lot while rebuilding my engines. I have two xlt 1200 from 2001, living in the Netherland. Rebuilded the carbs and used osidebill resipe:

1200R Aftermarket F/A's (Flame Arrestors) chokes intact

• • 110 Pilot jets, 1 turn out on low speed adjusters
  • 120 main jets, 1-1/2 turn out on high speed adjusters
  • 1.5 Needle and Seat, 95 gram spring (Dull Silver) 42-45 avg. pop-off pressure.

Just finsihd the first test ride, low RPM's pretty good throttle response. Max RPM goes to 6000 not to 7 before oside bills reciepe, really missing power and speed. Not very response on the throttle.

cylinder 1 wet plug (fuel)
cylinder 2 wet plug (fuel(
Cylinder 3 dry plug like supposed to

Can anyone please send me in the right direction? Have quite a lot experience with maintaining my ski's. Dont want to search hours if somebody knows where to look for.

Many thanks!

[MassimoD]

Stock carb's, cleaned and completely rebuilt. Stock reeds, stock manifold.

Acc. pump removed
Chokes removed
Carb restrictors drilled out 1/8"
95 main jet return
Oil injection removed
Fuel selector deleted
Extended and clunked dual fuel pickup's
Dual Yamaha filter/seperator's
Modified stock air box lower half, with stock screen and lid
Front intake ducting removed

110 pilots
120 mains
95g springs
1.5 n/s _ 44psi pop off
95 return restrictor _ 1+ psi at idle

Just ordered everything to do this! Minus the return restrictor setup. Will be doing that next. Looking forward to getting this ski running as i have never rode a ski before!

[Hurricane1000]

Firt time poster, used greenhulk a lot while rebuilding my engines. I have two xlt 1200 from 2001, living in the Netherland. Rebuilded the carbs and used osidebill resipe:

1200R Aftermarket F/A's (Flame Arrestors) chokes intact

• • 110 Pilot jets, 1 turn out on low speed adjusters
  • 120 main jets, 1-1/2 turn out on high speed adjusters
  • 1.5 Needle and Seat, 95 gram spring (Dull Silver) 42-45 avg. pop-off pressure.

Just finsihd the first test ride, low RPM's pretty good throttle response. Max RPM goes to 6000 not to 7 before oside bills reciepe, really missing power and speed. Not very response on the throttle.

cylinder 1 wet plug (fuel)
cylinder 2 wet plug (fuel(
Cylinder 3 dry plug like supposed to

Can anyone please send me in the right direction? Have quite a lot experience with maintaining my ski's. Dont want to search hours if somebody knows where to look for.

Many thanks!

.

[speedysprocket]

Bringing up an old thread. I contributed to this a few years ago with a 2001 GP1200R I had that was stolen right after I got it running right...
Well I just bought a 2000. Got the carbs off to tune them the same, but all the fuel pumps leak. Even with new gaskets, I can’t get them to hold pressure to even attempt to set pop off. Anyone run into this before?

[Oleg Russia]

if you are using a non-original repair kit, then you have a gasket on the pump made of solid material. I'm talking about the one that is black under the first cover. because of this, the pump will not hold pressure.

[Jonesyfxr]

My pump bodies were pretty corroded. I had to sand mine smooth again. I have not tested the pop-off tho.

[Pilotoat]

Hi All, first post after reading countlessly over the year.

I recently purchased a 2000 GP1200R FULLY STOCK with Cylinder 1 piston seized. I thought this was due to the oil line detached, so put back together with a new piston and further seized a new piston around 4500 RPMs. This lead me to realize I need to rebuild the carbs.

I order the Mikuni rebuilt kit for all carbs, but think I should also change the jetting to richen the carbs. Again currently everything is stock and have a 1.2 needle / seat, so trying to better understand if I should replace the 1.2 needle with 1.5 and increase the pilot and main. I did have a 115 gram spring, but the rebuilt kit looks to have a silver 95 gram spring.

Not sure what my ideal pop off pressure should be after all of the changes and tweaks proposed. I would like to keep the machine stock (oil pump, accelerator pump, but just richen it up so I do not have a seizure again).

[Jonesyfxr]

You have the ever so popular mid range seizure. This is due to the lean stock carb settings. Go to the 2 stroke section and look at Oside Bills recipe or “Carb settings I have used”

Lots of knowledge here.. you’ll get through it

[Pilotoat]

You have the ever so popular mid range seizure. This is due to the lean stock carb settings. Go to the 2 stroke section and look at Oside Bills recipe or “Carb settings I have used”

Lots of knowledge here.. you’ll get through it

Thank you will take a look. The issue is I keep finding the recipe for a combination with aftermarket Flame Arrestor, and I have the standard airbox.

Will keep looking.

[jetskiaz]

OKAY experts out there!!!

2001 Yamaha XR1800 2 fully rebuilt STD size motors

Air fuel separator with electric fuel pump being used to prevent air into carbs

Can i use OSIDE recipe for the carbs on this boat with return mod?

Can i just use his jetting and popoff specs that are tried on true or will the BOAT need different settings due to size and weight?

Anyone have a perfectly setup XR1800 thats wants to share their perfect reliable setup?

thanks in advance,
Chris in Arizona.

[ouzo]

cat removal gp1200r and gp1300r

If you replace the cat with a d-plate is it recommended to remove the accelerator pump and also to rejet the carbs?

Hi all.

New to this group and trying to wrap my head around the need for a cat or D-plate.
My question is - if you remove the catalytic from gp1200r or gp1300r, do you really need to replace with a D-plate ? can you just use the delete chic? what exactly does the D-plate do apart from create exhaust restriction / backpressure ?
Does it aid in the expansion chamber soundwave effect that 2strokes need in order to create more power ?
I'm saying this as I always thought the exhaust being submereged created enough necessary backpressure/restriction.
I previously had a rebuilt gp800r which had neither a cat nor a D-plate but still managed 80kph. reuilt carbs also worked great.
Thanks in advance

[Jonesyfxr]

Hi all.

New to this group and trying to wrap my head around the need for a cat or D-plate.
My question is - if you remove the catalytic from gp1200r or gp1300r, do you really need to replace with a D-plate ? can you just use the delete chic? what exactly does the D-plate do apart from create exhaust restriction / backpressure ?
Does it aid in the expansion chamber soundwave effect that 2strokes need in order to create more power ?
I'm saying this as I always thought the exhaust being submereged created enough necessary backpressure/restriction.
I previously had a rebuilt gp800r which had neither a cat nor a D-plate but still managed 80kph. reuilt carbs also worked great.
Thanks in advance

The D plate was developed to create some back pressure.... without it the ski is a dog.

[vinnied]

Same problem

Firt time poster, used greenhulk a lot while rebuilding my engines. I have two xlt 1200 from 2001, living in the Netherland. Rebuilded the carbs and used osidebill resipe:

1200R Aftermarket F/A's (Flame Arrestors) chokes intact

• • 110 Pilot jets, 1 turn out on low speed adjusters
  • 120 main jets, 1-1/2 turn out on high speed adjusters
  • 1.5 Needle and Seat, 95 gram spring (Dull Silver) 42-45 avg. pop-off pressure.

Just finsihd the first test ride, low RPM's pretty good throttle response. Max RPM goes to 6000 not to 7 before oside bills reciepe, really missing power and speed. Not very response on the throttle.

cylinder 1 wet plug (fuel)
cylinder 2 wet plug (fuel(
Cylinder 3 dry plug like supposed to

Can anyone please send me in the right direction? Have quite a lot experience with maintaining my ski's. Dont want to search hours if somebody knows where to look for.

Many thanks!

I have this same problem. Any chance you're still on this site and figured out the issue?

[Jonesyfxr]

I have this same problem. Any chance you're still on this site and figured out the issue?

Check the fuel line and carb for restrictions

There has to be a blockage somewhere on that carb.