got some more fuel on my standard GRP in my xt8 and it is feeling good. i am running the original Ninja pipe the 2053 i think with a nova header and it is really good.

Help me out, Is the GRP turbo plug the only that works in this motor or can I use a P3, novarossi, O'donnell, etc. thanks Marcus

There is a nice tool called "search this thread"...

But to answer your question, the P3 works fine in it.

that search button is just way to easy

the grp , o.s., and odonellsplugs will all work ....cant say about any others ...havent used any others than those ...or seen them used

ZIXXER, Thanks for the response, I have run the fioroni clutch for quite awhile and the clutch shoes do look in great shape, but I do have the stock springs still in it. My last thought was to get the stiffer springs to allow it to spool up a little higher to help out with bottom end. Also I have heard the ofna 053 or DYNAMITE 053 work better with this engine. I will try both options next. Thanks!!!

no problem ..cant say for sure ...but i know the same thing plagued me ....i finally had to drop the fioroni ...it is a great clutch ...no doubt ...i got many gallons out of shoes and springs ...but in the end i had to get a 4 shoe aluminum clutch ...and never looked back ...the fioroni can work really good but it takes some fiddling ...it took my buddy i pit with to determine the springs wore out alot faster than the shoes ....but springs would be a cheap option ....

anyone had trouble with a leaking crank case bearing?
my motor is brand new I have run about 1/2 tank through it and noticed fuel leaking underneath near the flywheel, havent pulled it apart but it seems to be coming from the crankcase bearing.

First Grp =1.5 gallons .....front seal failed ... no compression... ran lean
Second Grp=1.75 gallons ...lean ...dropped element an destroyed
Third Grp= not broken in yet ..keeping fingers crossed.
Horizon needs to get their shit straight. I am tired of them telling me backwarsd ass settings on these engines. I know they are bad ass engines but I am not the only one who is getting bad info from Horizon. I wasn't gonna say anything but it seems they are telling these backwards ass settings to everyone. I call Bullshit!

On the subject of engine bearings will TKOs in the sizes of Rear Crank Bearing 14 x 25.4 x 6 and Front Crank Bearing, 7x19x6 be the correct size and drop right in?

on tuning with the lsn/hsn, i have learned from experience and help on forums to no just rely on where the needles are. i turn them until it runs like it is supposed to. if you have two carbs from the factory and the taper of the needle is off a fraction those two carbs will tune a little different. sometimes if they are acting up it may be just a small leak somewhere, so be patient and check it out and you will get it.

I had no problem installing the TKO bearings. After installation the engine runs great, the stock front bearing is useless. Out of 3 GRP engines 2 of them needed the front bearing replaced after only 0.5 gallon.

r1harper, I don't normally rely on stock needle settings either but I just couldn't get the GRP.21 engine to run correctly (perform) SO i needed a base point to tune from. I have read several different forums on the GRP and several people have given their stock settings and they are almost all different . Makes me think GRP just turns them out from closed to a desired point and stop. My GRP.28 has been flawless and has a ton of power. in fact to much. I run 7k f, 15k c, 3k in the rear and at about 15mph if I crack it wide open the front end comes off the ground.

tristyn, i hear on that. i have had some like that. at that point i walk away and do something else for a while then i rethink everything and go back at it.

+1000

Anyone need a GRP .21 Ninja cooling head (used) or carburetor (used)

Just doing a little cleaning up in the garage and found these in the work bench...LOL




If interested email me at [email protected]

I'll make you a sweet deal on them.

I can ship them:
USPS First Class Mail
USPS First Class Mail (International)
USPS Priority Mail
USPS Priority Mail (International)

Thanks and best regards,

Tony P.