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Thread: jinxed gp1200r

  1. #1

    jinxed gp1200r

    Hey guys. I have'nt really done much posting on here but i've spent countless hours reading really useful threads posted by others. I Wrote a thread a while back about my gp 1200r (2000) beacause I was having problems allover, from the cylinders to driveshaft to p/v's.

    Ive rebuilt the engine, checked over the power valves and redone the whole drive shaft on the ski. It ran great for about half an hour but then started really bogigng down, so i took it home and ran it on the tap, but the revs were very eratic, it seamed to be bogging down and then giving short burst of full throttle, and then eventually stalling. I hadn't touched the carbs up to this point, as I dont really know anything about carbs and cleaning them.

    So I pulled the motor last night and got the carbs off. I bought the ski knowing very little about it but I do know there is a primer installed, also there is no choke anymore, and the butterfly paddles have been removed for the choke from the carbs. Ive striped the carbs down today, not rally knowing what im looking for, I did get a whole heap of fuel out of them, but i was surprised that there was very little sand and sediment in the fillter and the carbs in general. How dirty are 'dirty carbs' supposed to be? also theres a couple of spacers between the carbs anf the block, one is a mikuni Il grab some photos of these.

    Compression is good on all cylinders so ive rulled out that, I will post pics of each individual carb so you all can get a look at what I'm dealing with. Does anyone think it's also worth changing the plug leads, because I got a feeling theres a couple of hairline cracks in the casing's over the plugs (particually the front one) that could be discharging the spark, as the spark doesent seem to visually look as strong as the rest.

    Sorry for the long winded post but I wanted to put the full picture out there to you all


  2. #2
    Just relax and enjoy the ride. XLT Chad's Avatar
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    Since you have the carbs out, now would be the perfect time to rebuild them. Order some mikuni kits from the on line store and follow Oside bills how-to's. Atleast this way you know what is going back in them and they will last for years now. The small filters inside the carbs can get a glaze on them and make your ski run like crap. Also the diaphrams dry out after awhile.

    The spacers are normal.
    Throwing in a new set of wires isn't a bad idea, the jackets on those get brittle after a while.
    Good luck, hope this helped.

  3. #3
    Thanks for the quick reply, Il order the kits asap to get them done, also change all the fuel lines going to the carbs as they are looking pretty worn, correct me if I' wrong, but the diaphrams are the black circular things?? they are very very dry and almost kinda warped, I'l make sure I take a pic of it to show the ware.

  4. #4

    carb pics

    Hey as promised heres a few photos of the carbs all are in the same condition.
    It still has the accelerator pump attached but from what I can see it is unussed because theres no lines running through it.

    The ski was originaly used for racing so i would imaging that it would have been re-jetted when the accel pump and choke were disabled and the primer was installed.
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  5. #5
    Heres 2 more photos of how the carbs were setup apologies about the poor images their all i had on my phone of before rebuilding the engine a few months ago.
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  6. #6
    urugol's Avatar
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    Definitely time for a carb rebuild!

  7. #7
    mudslanger's Avatar
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    Those carbs need a good cleaning try to remove as much of that oxidation as possible.

  8. #8
    So today after work I managed to remove the cover from the rear carb (the one with the accel pump attached) I had to slot the screws and impact them out. :S

    how do i determine if the jet's have been ported or not? also i read in a article here that the air filter should be removed and changed for the individual filters to aid with more air intake?

    So here's some photo's of the iners of the end carb, it is way worse than the other two, could this have caused the ski to die shortly after the rebuild and first ride. I mean, could some of the crap in the carb dislodge and stuff its function up?

    Ignore the pic of the nozzle and the ski, i added them accidentally and havent figured out how to remove them from the post !!
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  9. #9
    Just relax and enjoy the ride. XLT Chad's Avatar
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    Wow, its amazing that ski ran at all. PM Oside Bill and see what he recommends for getting the rust and oxidation off. He can also recommend what jets to use. You also may consider sending the carbs to him, he does some amazing work. Just a thought.

  10. #10
    tell me about it, I would send them to him but I live in Australia! So Im gonna have to take my time and have a lot of advice of you guys when rebuilding them, Im repainting the ski also whilst all this is going on so hopefully il be all done for my camping trip on the 30th (fingers crossed)

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