Deffinetly not a bad motor....Its going to have a lot more bottom end than the 21-4. You can harness that with a shorter manifold which will also improve the top end on it, as it does top out fairly quick. Not to say that its bad, but redline is about 37-38K.


Run times with a 2096 or 9901 will be about 8-9 in a buggy easy...possibly 10 if you are smooth on the throttle.


And for $140-150 its a awesome deal...

Thanks Jerm

So... Quick question for the Nova gurus. I've got a Beat BT4 Plus that has served me well for a long time. the sleeve has been pinched before and now it's losing compression again. I'd like to pick up a new piston and sleeve set for her, but they are pretty hard to find. I know it uses the P7 conrod like my Plus 21-4 BTT, but can I use the piston and sleeve set too? They are much easier to find. Thanks in advance for any assistance!

You can get it pinched again I believe. Just change rod and wrist pin and clips as well. Bearings if they are not good

the beat BT4 uses the BTTw/c piston and sleeve I believe, just to be sure where does your sleeve index?

The sleeve indexes on the left side of the engine.

Ah then it's not the same

Anyone knows w bearing sizes on mito 4?

Novarossi Rear Bearing 14.5x26x6x5.7x4.7mm - 11 Steel Balls - Answer RC Ltd.

Novarossi Rear Bearing 14.5x26x6x5.7x4.7mm - 11 Ceramic Balls - Answer RC Ltd.

standard big block front bearing will fit... or Nova

Novarossi Front Bearing 7x19x6.3mm Double Rubber - 8 Steel balls - Answer RC Ltd.

Hi
Back in to nitro after years away with brushless motors.
Missed the noise and the smell !
I got a great deal on a brand new BONITO 21-7XLB.
What would be the best header to use (i have a 9901 and 2096 pipe)
Also looking at what is the best clutch to use on this set up.
I have a Losi truggy , but looking at getting an MP9, so hope to put the motor in that.

Many Thanks
Tom

Hey looking to get a novarossi for my kyosho any feedback on which would be best? Also what exactly is the pre run? Complete break in or no? Thanks

Hi, hoping to get some information for an old Top engine.

Bought a buggy on ebay, came with a top engine (without any of the paperwork/certificate) which after much searching (and the wayback machine) I think I've narrowed it down to a 2004 PT21RR1/N.

I'm after any information from anyone who is familiar with the engine and how it compares to modern motors. It still has some pinch at the top, but want to know if its worth buying the parts for (getting rare now) or when the time comes investing in a more modern engine.

Thanks in advance.

Hello Novarossi fans ... I have a question about these two engines !!!
Ultimate M5 and Novarossi P5XLT.

The engines are the same or have differences between one and the other. In internal engine
In terms of practical regime are equal 6000x36.200RPM.

Hi, Not sure if this is the thread to ask but does anyone have any info or experience with the ProTek RC Euro LS-5, the crankcase says its made by Nova. I'm just wondering since i'm just wondering if its similar to the Drake engine cause i love those but it might stop being available soon.

Just bought a keep off 21-4 with 9901 pipe and 41021 manifold. Running on med size track, technical with turn into jumps,single doubles etc.. and one long 150 ft back raising straight. This combo was suggested by a top local racer. Now reading this form maybe a far better pipe combo??? Lhs hasn't put order in yet