One of my fav truggy engines is the p5 , with some new improvements to the p5xlt I think it is an engine to be looked at . Plus 21-7fms is another engine that is an over the top power engine .

I would recommend p5xlt w/9853/41021 or 41005 in your case for truggy , plus 21-4C or C "team" for buggy with 9901/41021 or 41005 . I prefer 41005 header personally . I got the 2084ss pipes in yesterday so I will be trying those out soon .

Will do Houston.

got no pm from ya bro :confused:

Houston,

I see alot of post were your talking about the p5xlt. Like the post above the p5xlt instead of going with the toro nero. Is there a reason why you would rather run a p5 then the toro?, I have noticed this in other post as well. What are your feelings on the toro?

Thanks James

yes i like the p5 over the toro ;)

thats all i will say about that :D

do 3 heat cycles within the first tank up to 210 degrees (5 min. intervals),at idle on stand? yes
you will have to play with the low speed needle and idle adj. , use rag or sock or whatever you feel suit to cover head .

run it around gently at 210-230 (monitoring temps frequently ) careful not to let the engine get into its powerband about 1 full tank at a time (or 10 min.) , let it cool , do this for 3 tanks (cooling in between tanks), quarter throttle or so with short blips..not high?slow pulls on the throttle in 30-40ft bursts.

richen the needles a bit and run it about 180 on the track ( or street) for 3 straight tanks (or 30 min.) monitoring temps frequently leaning it out until you can start to feel the powerband (check the plug at this point and let it cool down),what am I looking for exactly on the plug ? make sure the plug still glows and looks new, if it looks all distorted pull it out as you dont want a plug filament to go through the engine .

go back out on the track,(lean out slowly) when you get it tuned in to where its not totally screaming but you have enough power to make the jumps with a slight bog at full throttle and runs at about 180 - 230° , let it cool .
go out and run the rest of the gallon til the power comes up and the temp drops instantly (i call it "dropping its nuts"). this process sometimes takes more than a full gallon . use a heat gun to heat to 200 before you start at each step

hope this helps ya , pretty detailed

monty

do it just like i said and you will have great success

main keys to break in
- use good quality fuel such as byrons
- do not over rev engine!
- keep between 180-210°

:):nod: nuff said;)

broke in yet??;)

I put a lil over a hlaf galloon on it! Really likin it so far

Hey Monty, how do you like the 21-5k engine? I saw someone else on here was talking about some really good run times.

they are a good engine . they are put out by siim racing now , not sure if they are still doing well but thats the last i heard . i still have a few piston/sleeve sets , one tuned and one not.

21-7fms
 

Houston,

That FMS is awsome. I have about 1 1/2 Gallons on it and it finally came in. I'm trying to get a race tune on it now and i'm having some troubles. I am using the same venturi that came stock, I'm running a 97T plug and picked up a Dynamite 053 pipe and header, and i'm in california Sea Level. Can you give me a starting point for needle settings. and possibly what the needles were stock.

I'm super fat now and i'm getting about 9-10 min can't wait to see what kind of run times i'll get with a race tune.

Eric

the fms needs a little extra fuel on the low speed so do not get the low speed too leaned out . it has some different ports that effect fuel scavenging from the crankcase . needles with what you got setup should be around 4.5-4.75 turns out on low speed and 3.5-3.75 on high speed

dont be afraid of temps in between 235-270°

Monty can you tell me which Novarossi header this is. I bought it a few years ago and its not marked and the package didnt have any numbers on it either.

Thanks
Russ

monty i got some ?
plus 4 9853 401210 or what ever header they run with the 9901
od 97t plug

the motor takes a min to fire up on the box it dose not just fire. once it dose it lean for like 3 laps and then it fine and purrs like a kitty what am i doing wrong