No it won't work. Seems a certain engine modder
told alot of us that it would. I say if I can't trust
him for some advice I can't trust his work either.

i concur.

odo99t. the os plug has a different taper! sure it works but isnt correct taper. i ran all my grps with a odo99t and they ran at 190 degrees with perfect power. i sold all my grp stuff and moved on. this whole rod thing that grp left us with wasnt cool.

THIS IS WRONG INFORMATION.....

geo-y-rock did the measurements and found the taper to be the same......i have used os plugs since day one with these motors....they work great....the only plg i had problems with was the od plug....they would leak...thr the plug, you had to kung fu grip em to seal them...

i will find the post by geo...

here is the post in this thread

http://www.rctech.net/forum/4398158-post186.html

on the 3 grps i ran through the past year alls i used was odo plugs. coming from you il take the word as the gospel. i never had a leak and everything i ran, of which were rebuilds that had good lifespan. but i also have to say that i was told not to run os plugs in jammin jpx engines and have been doing so with great success. in my area everybody has ran the same odo plugs as i have...exept for 1 out of a good dozen that i know that ran an os p3(only 1 grp ran on os and was fine). im not about to argue with mr. losi...no doubt....considering youv ran grp longer than i have..i am waliking away with your word!...its all just a shame that grp has dwindled into what it has....

the od plug worked one just had to make sure it was properly snugged...

it is a shame that a good motor has been brought down....i have 3 of them along with a spare rod and piston/sleavenot sure how much longer i will keep them, but they are not worth anything so, i will just burn em down, and get something else...

im still using 2 of my grp buttons. and now that you got me wondering they do seem a little over snug with the odo plug. the one last turn is a little over snug, almost squeeks lol..so i have to agree with you.

To add to CasyP's response--Geo, or another user, measured the taper angle of the ODO plugs. The ODO plugs had a slightly different taper. Those guys suggested to keep using the same brand of plug, which ever that may be, that has been used in the engine previously. Switching back and forth from ODO to GRP/O.S. is where the leak-by came from. They mentioned the taper creates the fit and seal. If you use the different taper then it won't seal properly.

Someone correct me if I'm wrong here. But that's my recollection of the previous discussion regarding the turbo plugs.

this would be correct, i always use os plugs, and tried a od.....it was as 8 said....it was tight on the last turn, and squeaked.....if you didnt do that it would leak..

i willl put a grp plug in and see how it is...

I appreciate the clarification. although im not running grp im still using there head buttons...

The question is,will someone find a replacement con rod .

i confirmed with nitro house today that they have one of these in stock

http://www.nitrohouse.com/catalog/pr...ducts_id=16760

let the feeding frenzy commence:nod:

No; they should not.

It's supposed to be sitting in a certain someone's desk drawer with my name on it since Fri or Mon; don't recall which day I talked to 'em.

Seriously...Not joking at all. Though it's not out of the system, they shouldn't be able to actually find it when they go look for it.

omg what a find!

Unbelievable..

i felt sooooooooooooo bad about the wrong r7 rod info ....and yeh mlgr is right because it didnt come up in their in engine parts area .....came up on a google search under the part number ....goes to show you cant always believe what you here about compatibility ...ive got a standard that needs a rod ...hell with it i will run my other 2 grps that are doing great ....i would a got it if id had 50 bucks :blush:

If anyone *has* to have it it is for sale ;)


For ONE MIIIIIIILLLLLLION DOllarz...:batman:

Just bought a used Tuned. Going to run it with my JP-2.

Hopefully get a good 3-4 gallons out of it. (It's got about 10 gallons total on it, and was just pinched. ;))

i would be worries about the rod.

The seller said it's a new rod. I think it ran it a couple times that's it. So new rod, new bearings, and fresh pinch for a great price. If it lasts me 3 gallons it's paid for itself.

I have a new piston,sleeve,rod and wrist pin. What is it worth ?

search for .21 grp on ebay. it still has a few days but there is a nip tuned rod:nod:

Would an OD 97 or 99 work better in a Tuned running 30% in 100 degree weather?

97

I just picked up a used GRP .28 MRT with grp exhuast (2053). I got it for $100 bucks and its not in the bad of shape at all.

Until i thought. I have a really high idle after high speed passes. This is my first GRP so i had to do some research to get the correct needle settings and to read about all the different things people go through. Well the guy i got it from used OS p3 which i found out after is a bad idea. Im assuming the plugs will leak. Would that be the cause of the crazy idle?

When i do a high speed pass. the engine will be revving high then it will go down after 20 seconds or so. then if i just tap the throt it will go right back up.

Well i couldn't figure it out for the longest time and it was about to just be a shelf queen at this point. I really wanted to use this mill. so i picked up new p/s, rod, pin, clips, front and rear bearings. cleaned up the inside put her back together than started her up. Well same problem. I sealed the engine's carb and backplate while it was apart too as i do with all my engines.

I still dont know what is wrong with it, maybe its the plug that im using. i just ordered a new head button so i can run the grp plugs. Im hoping that is what the problem is.

has anyone ever had this problem? If so, what did you do to resolve it.
i just got my untuned grp .21 yesterday. So if i can't fix it, im just going to swap the parts that i can with the .28 and .21.

thanks for all your help guys.

tooo lean on the top

the guy you bought it from used os plugs, what did you use???

i am sick of ppl saying you cant use the os plug, because you can....i have not changed back to grp plugs....i will put one in, and i will bet it wont leak...

the os plugs are fine and about 5 dollars per plug cheaper than the grp plugs....

I'd rather use OS plugs myself. I run them in my OS Speed and love OS plugs, they last so much longer.


i actually had it on the richest setting it would run on and it would still idle like that.

Could it be that im using 20% nitro? i know that these engines come from the factory to run 30%

its driving me crazy. Once i get this untuned broken-in, ill throw the .28 in and give it another chance.

if i used os plugs, am i able to put a grp plug in? I heard that the taper is a lot different from the os. then again you can't always believe what you read these days.

thanks for the replies.

I know this sounds crazy, but I strugguled with the same problems with my MR Ninja (GRP)

The cure:
Lean idlegap and lean LSN propotionally.

Do it.... Dooo it ;)

do you know how many turns out the LSN is? Someone else told me that I had my LSN to rich so it can't burn all the fuel that floods into it.

I'll give it a shot. GRPs are so much different to tune IMO. you have to make the smallest adjustments.

As a general rule i found:
Idle gap - smaller than you'd think
lean bottom - rich on top

www.raceprephobbies.com has four losr2043 rods in stock. I just ordered one. Kinda salty at 62 bucks plus 10 for shipping, but i think its worth it.

allmost forgot; P3 or ODO97t - or a really hot grp plug

I have 2 extra rods right now already. Thanks for the replies. i run the P3 in there already. I was even thinking the P4 at this point. I'll close up that idle and try messing with the LSN tomorrow. It's about to rain here.

I hope i can get this to work!

I have 2 extra rods right now already. Thanks for the replies. i run the P3 in there already. I was even thinking the P4 at this point. I'll close up that idle and try messing with the LSN tomorrow. It's about to rain here.

I hope i can get this to work!

bottom too lean idle not set right giving you false readings and irratic running

its not that os plugs dont work its just that they deform the head button and it makes it next to imppossible to run the plugs that work the best ...odonnel 97t:nod:

you know how to tune a grp sir:sneaky:

6.25 turns out from bottom is stock on the lsn
3.5 turns out from bottom on the hsn
idle gap 1-1.5mm

you definitely know how to tune a grp :nod:

there have been some random grp parts popping up like everyone else said ...i picked up a tuned piston and sleeve nip on ebay for 65 bucks ....if anyone has a tuned rod pm me i would be interested :tire:

Zixxer, thank you man! I was so rich on the LSN. Im going to put a OD 97t in tomorrow and give that a shot and see how it runs. I can get those for like 5 bucks a pc. If they work great im in luck.

Also Zixxer, Ill check tomorrow at the shop if they have any rods left and let you know ASAP. i think they are like 30-40 bucks. Have to double check. But, i'll get back to you.

Thanks everyone for all your replies! :)

My tuned .21 popped a glow plug coil and siezed this weekend. I need a new motor (diff brand) or a piston and sleeve. You find anymore of those parts Zixxer? 65 bucks is still cheaper then a new mill.

dont switch from os to odo plug. that will strip your button for sure. im pretty sure that os and odo are totally different taper? if using os i would stick to them and odo i would stick to them. i didnt read what all your issues were but you may already have a stripped button.