Got a link? Doesn't matter how I search it still doesn't come up

Here you go

http://tkocompetitiondev.com/product...lkeep-off-4-2/

My bad... Roelof is right.

http://novarossidirect.com/16006_p_2238.html

The keep off bearing is a 14mm, the Virtus needs a 14.5

I wouldn't have thought fuel would be the major corporate here at 4 galons it just seems too early, I was going to make the switch to byrons 30-9 but now I don't think I will reading the responses here about this issue even though I think it's more than just a fuel issue at 4 gallons there must be something else that's gone on and if the OP has a speed with 8 or 9 gallons on it could just be a faulty bearing or dirt/grime. Maybe you could share some pics of the bearing if available so we can see what it looks like. Novarossi are kind of reminding me of Apple and their iproducts with their bearings not being available anywhere else out there but from them .Can anyone manufacture this bearing if they chose too? They would probably alter something else when that happens anyway, I mean you can look at it like smart business or poor business I suppose depending on your view of it, me personally I don't like it and think they would sell more units if replacement bearings were readily available atleast at the current cost of them anyway it's rediculous like Op is saying he is already contemplating just swapping the mill out for something else at this point already. Man I'd be bummed wether it was poor maintenance on my part or not I still wouldn't be happy.

Low oil content like 8% is ridiculous for anything but a 1 run World title A main engine. Those who are saying castor are 100% correct, even if it is only in my experience. Engines run cooler, more consistent and last... to the point where I decided to run in a new engine because I was bored with the old one not dying, at 45 liters. Done that twice now, still got the other for backup ready to go...

I would gladley use 8% oil in my fuel if i could have blended it myself with the oils i have been recomended by som very good guys i.e fuelmakers in Europe.

These special bearings do not add a thing to performance and milage as Novarossi wants you to believe. It is marketing to sell replacement bearings for a high price. And because it is patented I think other manufacturers have to pay a lot for making such a bearing.
But maybe there is light at the end of the tunnel. Last onroad worlds was won by Kurzbuch running a special Mito 9C which is now introduced as a Mito 35. This is a Flash based engine, so a normal longstroke (16.8x16.2), no special bearing and and no offset carb. It looks like Novarossi is going back to basic.

If you have the machines you can modify a normal 14.5x26x6 bearing, take it appart and grind the inner race a bit smaller.

Another thing which is easy to do with a lathe is to take out the dam inside the crank case, I have it done once.
http://www.rctech.net/forum/onroad-n...gs-virtus.html

The dam preventing the placement of a normal bearing:


And after a few minutes work:


The engine is just running the same with a 20 dollar bearing

I don't for a second believe I would be faster running 8% than 12% or something, just like I am not faster running 30% nitro to 25%. I do believe my engines would have less longevity, and less margin for error.

If you are at a level where you measure consistency in 0.1 second intervals, you probably would be faster and you wouldn't care about the seized bearings and destroyed conrods that these threads are filled with.

4 gallons is standard for an engine. Usually when u run it with safe tune (slightly rich), it will last more than that. High quality fuel is recommended and most important is you know how to tune. Bearings usually will last throughout engine life span till loss of compression. Proper break in + good tune = bargain

YES.

Quoted because more people should read this.

thank you sir

i dont have any pics of the bearing but it did have some slop to it..

this is the first engin I have had any trouble with before 6 gallons. not saying I'm an expert by any streach. Had I known the S storm it would have started I would have never asked the question. prolly will never ask again either.

Just add some castol oil for fully synthetic fuel to make it safer to run...

Tune for good power n not extreme power, most motors dont do 10minutes unless u try to be extreme

I bought a brand new Novarossi PLUS 21-4 BTT, new 9901 pipe and a used 41021 Header that was a back-up for a friend of mine. I didn't get the pipe springs for the engine to header or from the header to pipe. Can someone give me the part numbers to the right length springs for this combo?

Thanks . . . Matt