08-06-2008, 12:13 PM #1
gp1200r (gp1460r) overall poor performance question
i have a kerry 1460 setup in my 2000 gp1200r. he has been very helpful but i want to get some input on here. i used the ski 2 times this summer and both times i wont go over 50mph. and its a dog off the line, doesnt seem any faster then my gp800 off the line. i seem to be hitting 6,000rpm and thats it. it literally goes nose to nose from dead stop to full throttle the same as my buddy's 2002 fx-140 thats STOCK.
heres a quick breakdown of the ski.
new oem crank, oem keyway not a 3%
kerry 1460 top end kit (pistons,cylinders,head work, head gasket)
oem head reworked by kerry
rebuilt carbs by kerry to match setup
stock exhaust with d plate and chip
island racing ho pump and impellar
the first time out i had stock pump with an old 14/20 impellar
and second time out carls setup no diffrence at all... so i know its motor related.
i tested the pv motor time and time again and seems to work, even disconnected it and bypassed it and still same 6,000rpm mark.
i compression tested the motor and got 130psi on all 3 cylinders which seems low to me but all 3 are the same and the motor is about 3 hours old now
UPDATE: KERRY WALKED ME THROUGHT THE SKI AND WE FOUND OUT THAT THE FRONT PLUG WENT DEAD AGAIN. 2 PLUGS DIED INSTANTLY
NOW I HAVE TO FIND OUT WHY
heres the problem with the plug on the front cylinder this happens. the plug treads are a greyish color, the bottom prong has a little black on it, inside ceramic is clean. but the top ceramic that is white and says BR8ES is bent. happened with 2 plugs. the bottom is fine its not hitting just the top is bent slightly.
Last edited by spyder3000gtvr4; 08-06-2008 at 01:28 PM. Reason: FOUND THE PROBLEM< NOW HOW DO I FIX IT???
08-06-2008, 12:38 PM #2
do the reeds look ok ?
08-06-2008, 01:37 PM #3
A bent plug on the top of the plug is very strange. Nothing can physically bend that portion of the plug. If that part of the plug is getting too hot somehow would it bend?
08-06-2008, 01:37 PM #4
hey mrb the reeds are brand new, but we found the problem a dead plug i updated the page but now i have to figure out why its happening. the white ceramic on top is bending and killing the plug the bottom is untouched and it only happens on the front plug... i attached a picture to help show what im talking about the red X is square so you can see the top is slightly to the left side. even kerry has no idea what would cause this, the first spark plug was bent a bit more.
you can even notice the blue lettering that says BR8ES is a little twisted it looks like the right side is higher then the left
08-06-2008, 01:39 PM #5
I did that once when putting the stinger in.
08-06-2008, 01:41 PM #6
just a fluke? bad plug by chance? never any issues again?
08-06-2008, 01:44 PM #7
why does he have you running the 8ES vs the 8ES-11 thats supposed to be in the ski?
I am in Kings Park, if you close by let me know I may be able to help you out.
PM me if you need anything!
08-06-2008, 01:46 PM #8
the head on the ski is oem, and it says on the head BR8ES
CORRECTION- i have been running the wrong plug apparently i just checked it and it is a BR8ES-11 i hope that is the whole damn problem
Last edited by spyder3000gtvr4; 08-06-2008 at 01:50 PM. Reason: becasue scittb rules
08-06-2008, 01:52 PM #9
I don't think its going to solve everything but you definitely need to swap out those plugs
08-06-2008, 02:06 PM #10
I have 2 GPR's sitting here with BR8ES plugs in them. Thats not the issue.
The difference is essentially the gap. This shows a little plug info for you to read up on.
Last edited by canadaxp; 08-06-2008 at 02:14 PM.
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