Cheers bro.

Is it worth getting some anti rust paint or similiar to cover the exposed metal with after dremmeling?

Cheers mate, thanks.

Ross

aluminum doesnt rust

Does anyone happen to have a p5xlt cooling head fs? If so please pm me.

i'm looking for some advice on a good engine for my 1/8 buggy. i want something as smooth as possible, it doesn't need to make a bunch of high end power, just smooth, easy to drive, and fuel economy. i am used to 1/8 electric where the power comes on smooth. top two on my list are the +4 and the P5xlt, but it looks like the P5 is geared more towards truggy. any recommendations would be great

Hmm
 

I like the p5 because it's punchy. I like that in buggy, but for smooth power the plus-4 is the way to go. I hear they get better fuel mileage but I havent noticed any difference. The plus-4 is easy to drive hard without getting into trouble. I still like the p5 better, but if you want smooth you got it with the plus-4. I recommend the plus-4c. It has the ceramic rear bearing, turbo button, and the cast piston. The plus-4 team is really nice too, but the plus-4c is the best running of the two. I have both.

At what litreage are people seeing the top end really opening up on their btt's?

about 8-10 ltrs novarossi take forever:(

Damn, thought it'd be something like that. I've got ~4l on mine and the bottom end and runtime are awesome but she don't rev out yet. :cry:

yeah a mate just bought a hudy bench would be a good investment if you get a new engine every year :nod:

How many turns out on the LSN and HSN for a properly tuned 21-4BTT?

I thought I saw on here 3.5 or 4.5 turns out on the LSN. That is way off of what I am at now.

I am sitting a hair in from flush on the LSN. Its about 1.5 turns out total.

Thanks

I am sort of in the same boat. I have 2-2.5 gallons on a Plus-btts and I can not get anywhere near 4.5 on the LSN. The motor still is really tight and can not really be turned over by hand. I set my needles at 4.5 LSN and 3.5 HSN Wed and it leaned bogged so bad it would barely run. I ended up having the LSN basically flush so I am at 5+ turns out just to keep it from lean bogging and dying. I am 1 hour in from 3.5 on the HSN. With these settings the motor ran very well and I ran it for 45 minutes straight but the temps were 265 to 280 but the motor had a lot of smoke and was really crisp with no flame-outs when refueling so go figure.

I have replaced all lines, gaskets, and done tests to make sure I do not have a leaky bearing and all passed with flying colors. I just think the motor still is not completely broke-in and once it loses more pinch I will be able to lean the LSN a little more. I have a well broken in P5 and I am at 4 turns out on the LSN on it and it is fine and is perfect.

My Btt/a is just shy of 2 gallons and hasn't dropped its nuts. My LSN is 4.75 out from bottom (just in from flush) Any leaner and it won't run right and stall. My hsn is just out from flush. Its making insane run time and perfect power. I preheat before everyrun and if I am in a bump up position, I'll put the heater on while waiting for the next main. Still very hard to turn over by hand when up to temp.
to reset your needles LSN 4.5 and HSN is 4 from bottom, Idle gap is .6mm with venturi out. But that would be after fully broken in. I tried to do 4.5 yesterday and it wouldn't run right.

+1 I am guessing another gallon and we will be there once it loosens up a little more!!!

Temps
 

Hey guys, what temp are you finding the Roma .25 is running best around. I have been running around 220. But as this is my first nova, and I keep reading temps around 260 - 280. I have got about 1 gallon through it maybe a little more. I'm in Brisbane Australia, about 74 m above sea level. I use standard no 6 plug with 41021/51020 and 25% fuel.