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  1. #1

    Facing a problem with my GP1300R < Newb> HELP

    Hey Guy hope all is well!!

    I purchased a used 08 GP1300R
    I rebuilt the motor and bored my cylinder to 85mm, i realized that the previous owner had canceled out the oil tank basically my gp now is like a yamaha banshee you premix the fuel and oil in the fuel tank rather than putting the oil and the gas in separate tanks. took it out for a ride i reached a top speed of 42kms before it automatically cut off started it again no problems played with it the next day and it cut off again at top speed realized i had fried my pistons? whats the cause of this? my mixing ratio is 50:1? now i have to re bore my cyl to 85.50 i use yamalube now im going CASTOR when i rebore my cyl. theres something wrong that im not getting this jetski fried my wallet everything else is fine! am i supposed to uncancel the oil tank fill the oil tank and premix in the fuel tank????

    I just reorderd a new set of cylinders from riva and a Dplate so i can use regular 2-T oil
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  2. #2
    Happily Self-Employed WFO's Avatar
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    bigger pistons need more fuel

    do you have an EFI controller?

  3. #3

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    You can't bore a nikasil cylinder.

  4. #4
    quadzilla's Avatar
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    ?

    Hey there..

    Firstly welcome to the forum..

    Looking at your pictures.!
    - I'd hazard a guess that this engine has had a massive failure previously to you becoming the new owner..

    There would appear to be a set of crank cases from a late model XLT1200 (A carbureted ski.!!)

    Can you post a picture of the other side of the motor showing the exhaust.

    Where all three cylinders fitted with steel liners before you rebored.?
    - Or did You have liners fitted. the reason I ask IS you didn't mention anything about them being Nicasil coated.??

    As for the oil Yamalube is fine. although 50-1 is quite a bit on the light side.
    - I'd personally recommend no less than 40-1. (I run all my own ski's about 35-1. Sometimes 30-1 if there is going to be any extended wide open runs)

    For break In 50-1 is absolutely "TOO LITTLE". You should really be around 30-1 (even as low as 28-1)
    - A castor/mineral oil is a good idea on the first tank of fuel, As Synthetic oils don't let the rings bed in as well.!!

    As WFO says bigger pistons need more fuel..!!

    Going from 84mm to 85mm is roughly a 2.5% increase in capacity.
    Going from 84mm to 85.5mm is roughly a 4% increase in capacity.
    - while these Increase's may not seem very much percentage wise, the fuel requirement goes up regardless.

    Have you had the head reworked to clear the increased bore/pistons.? similarly the head gasket may need enlarging.?

    What brand of pistons are you using.??

    Once you get the cylinder head off would be interested in seeing the pistons before you tear it all the way down..


    While you have it complete a pressure test might be a good idea..!!

  5. #5
    quadzilla's Avatar
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    Quote Originally Posted by rplaster View Post
    You can't bore a nikasil cylinder.
    EH..!!

    That information is 100% wrong..!!

    They can be rebored all the way out to 90mm if you want to.!
    - they will of course need new nicasil coating

    Alternatively they can be bored and have steel liners installed.!

  6. #6

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    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post
    You can't bore a nikasil cylinder.
    EH..!!

    That information is 100% wrong..!!

    They can be rebored all the way out to 90mm if you want to.!
    - they will of course need new nicasil coating

    Alternatively they can be bored and have steel liners installed.!
    He said he bored them. You can't just bore them and put bigger pistons in them. That's what I meant.

  7. #7
    quadzilla's Avatar
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    Quote Originally Posted by rplaster View Post
    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post
    You can't bore a nikasil cylinder.
    EH..!!

    That information is 100% wrong..!!

    They can be rebored all the way out to 90mm if you want to.!
    - they will of course need new nicasil coating

    Alternatively they can be bored and have steel liners installed.!
    He said he bored them. You can't just bore them and put bigger pistons in them. So I was 100% right.

    Do you seriously believe that ANY person with boring equipment or capability.

    would leave a RAW ALUMINIUM CYLINDER..??

    Is that what you are suggesting..???

  8. #8

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    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post
    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post
    You can't bore a nikasil cylinder.
    EH..!!

    That information is 100% wrong..!!

    They can be rebored all the way out to 90mm if you want to.!
    - they will of course need new nicasil coating

    Alternatively they can be bored and have steel liners installed.!
    He said he bored them. You can't just bore them and put bigger pistons in them. So I was 100% right.

    Do you seriously believe that ANY person with boring equipment or capability.

    would leave a RAW ALUMINIUM CYLINDER..??

    Is that what you are suggesting..???
    He is a newb, you never know.

  9. #9
    quadzilla's Avatar
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    Quote Originally Posted by rplaster View Post
    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post

    He said he bored them. You can't just bore them and put bigger pistons in them. So I was 100% right.

    Do you seriously believe that ANY person with boring equipment or capability.

    would leave a RAW ALUMINIUM CYLINDER..??

    Is that what you are suggesting..???
    He is a newb, you never know.

    Trust me it crossed my mind too..!!

    It just seems so far from likely that it should be discounted..
    - there is also the mention of ordering new cylinders from Riva in the first post..
    -- (I'm actually thinking he may have meant pistons.? As I don't think Riva do over size cylinders off the shelf.?)

  10. #10

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    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post
    Quote Originally Posted by quadzilla View Post
    Quote Originally Posted by rplaster View Post

    He said he bored them. You can't just bore them and put bigger pistons in them. So I was 100% right.

    Do you seriously believe that ANY person with boring equipment or capability.

    would leave a RAW ALUMINIUM CYLINDER..??

    Is that what you are suggesting..???
    He is a newb, you never know.

    Trust me it crossed my mind too..!!

    It just seems so far from likely that it should be discounted..
    - there is also the mention of ordering new cylinders from Riva in the first post..
    -- (I'm actually thinking he may have meant pistons.? As I don't think Riva do over size cylinders off the shelf.?)
    Thats what I took from his post. A lot of new guys don't know about the nikasil coating.

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