Generally the hotter the plug (say a P3) would be used in colder conditions and the cooler plug in hotter conditions. That's just a very basic way of plug tuning but its fairly safe.

madness2007- the "hotter" the plug, ie. a p3/rt3 will have these characteristics.
- a broader tune window
-more crisp bottom end
-little more of a stable idle, especially if the LSN is a little rich
-usually used for break in period due to good idle and richer tune ability
-will not last as long as colder plug before having to be changed

a colder plug will usually
- narrow the tune window making the tune have to be more spot on
- increase top end performance slightly, smoother bottom and mid range
- be less prone to flaming out ( in my experience a 4 series plug or 97t has provided the best performance all around with greater dependability)

I would say for everything except extreme conditions a hot or medium plug will suffice. If the p7 is working for you great, but that is not a very popular plug among most for these engines.

Why is the P7 NOT a popular plug for these engines?

The only plugs i run in all my engines are either OS P3s or OD97T.

i been running nothing but a p4 all summer, now the temps are gettin colder i am running a p3 in my reedy, p7 i beleive are more for onroad cars

let me tell u one thing, i had nova, rossi, rb, go, os, ninja, all the high end motors i even had a go engine, and i tell ya from my experience, the reedy is the most reliable and good power engine i ever had, it holds a tune all the time, and runs and dont flame out, i wasnt really impressed with a go engine, sorry to say that, but i had nothing but good runs with my 2 reedy engines, i will say again, it is by far the best engine i ever owned

Does anyone know a good starting point to set my needles at ?? I'm not talking stock settings I'm say what's your settings? Stock setting can b as far as a turn rich on both needles.

every motor is different, between my 2 reedy engines both are set at different points, best way is to start at stock and tune from there

I just got my Reedy engine back from Associated after having the silicone coming out of the crank. The customer service there is beyond good when I got it back I looked at the invoice and the Piston, Sleeve, Crank and head button where replaced all free of charge. I personally will be running Reedy engines from now on. Thank you Associated

Whats everyone race temps with there engine at?

Don't tune for a specific temp. Running temp depends of many factors such as weather, fuel, glog plug and tuned pipes.

I tune my 121vr for performance and read the temps once the engine is performing like I want/like. Normally temps are between 220 and 260.

From what I read, many racers run their 121vr upto 280...

Good just checking didnt want to melt my motor down. Thats about what I was running more on the hotter end but its funny when you ask someone that runs their engine at 190-210 range and tell them you just hit 260 they look at you funny like your retarded!!! Im not saying that im not because I hear it offten

I asked Brandon about his temps he said he runs 260-270 for club racing and 270-280 for big events. His motor was screaming at the Ohio State fair.

Thanks buddy

Man I love this engine!!!