With fuel tubing on the carb and motor out with pipe and air filter off, block both and blow on the fuel tube.. best way I know of to check for leaks anywhere on motor / carb.

What plug you guys running..the GRP #5 was a lil steep so i've been just running p3's i had left over from my vpec. Will the motor run coooler if i run a cooler plug??

Like I said, it may be something just wrong with THAT pipe, not sure. I
will stick with the GRP matching pipe for now though. I hate spending
all race day messing with engine tune stuff. Would rather work on the
car setup and my driving skill. Lord knows I need it.

i have had one pipe which never worked never idled and never supplies pressure to the tank i sent it back and they gave me a new one saying the something was wrong inside the pipe baffles ect once the new pipe was on no worries at all i had this problem about 3 months ago

your rite gms racing i have the 5 pack of grp plugs and i thought i was buying a block of gold but till this day i have not used one plug yet thay are good plugs

OD 97T got a bunch from amain for $4.99 ea, finally removed the break-in plug-only got 3 gallons out of it. Plug was still good just thought before my first rc pro main-what the hell put in a new plug, its got 2+ gallons on it
Not sure if it will run cooler, but I'm sure you will get better mileage from a cooler plug-might need to be a little more precise on the tune
Ran a grp with 9+ gallons this weekend-had I pinched at THE SPEED SHOP (see rc tech thread) and did great-gonna use it as a friday practice motor

the plugs are pricey but i think they are very reliable , i still havent changed the plug and i have now put 4 gallons threw it

ok guys way to much to read through. I just picked up a GRP .21 tuned and will be installing it in a Losi 8ight buggy. I was wndering what plug to use, I can get o/s o/d or dynamite turbo plugs locally. Also i have a jp3 or jp1 i can install.

So what do you think woud be the best setup?

Thanks for the help!

I would say an OS plug because of the taper it fits the GRP head button better either med or I like the super hot P3 plug, I have also run the P4 in a GRP. My experience is that the OD plugs do not work as well in the GRP. For the pipe I would use the JP3 but thats my opinion.

im replacing my bearings in my grp this weekend what method do you guys use bake in oven at 350 degrees for 15 mins drop the old out and then put the new in ?

GRP engine tool kit. Makes chqning the bearings very easy. With the tool of takes maybe 5 mins 10 if you really take your time. Oven works too it's just like a hot potato when it comes out.

thanks for the info frank!

very true frank but finging the engine bearing puller kits here is hard work and every time i do an order thay are out ..... i assume they are quiet a popular and handy tool to have

throwing hot potatos can be fun

It is barely touching it and doesn't even push the boot in any

Suggestions on places with cheap spare parts?? Esp. o-rings and bearings.