guys, my plus 4c is somehow loosing its compression, the top end is gaining power but i am loosing too much in the low end. i though of removing 1 shim in the combustion chamber,(silver) just to regain compression(hopefully) and just re-tune it.

will it work?

pros and cons?

help guys!!!

Check your clutch set-up before you do anything else to it.
Weak or broken clutch springs, clutch shoes hanging up on
the flywheel pins, will kill the low end performance of any
engine.

clutch setup looks fine. assembly looks perfect. 3 aluminum clutch shoe, 3 1.0 clutch springs stock gearing for the mbx6. i am bothered about the fading of the compression of the engine.

options are, removing 1 shim from the combustion head(silver)

or replacing my clutch spring with a harder set(1.1 springs)

Try getting it pinched.

Give RayA a call. IMO he has the best P/S re-sizing service
there is. Rely on the best, forget the rest.
http://www.rayaracing.com/

ok guys Im all new to nova engines. I ordered the plus 4 2010 team version. I will be getting it tommorrow. What is the best way to break it in? I want it to last as long as possible. I have heard of nova engines going like over 10 gallons and that what Im after. I have been running the o.s. line of engines for a while now but they just dont seem to last more than 3-5 gallons before they start flamming out and all pinch is gone. One thing Im nervous about is its cold here in Maryland. Will this hurt the long term performance of my new nova If I break it in in the cold weather

Follow the break in bible here and always pre heat your motor before starting it.

Always Pre-Heat!!!!!!

if you wanna do that only take the copper one out , DO NOT REMOVE THE SILVER!!!

What about the seals on the exhaust, are they in good shape?

i think he is actually saying that the engine feels low in the compression department

flame outs? lack od low end punch? two tell tale signs of compression loss

Guys help me out Im trying to find out the size of the 4 head screws and the 4 backplate screws on my new toro nero team. Im replacing them with socket head screws no more flatheads. The screws are NOT 2mm, 2.5, 3, or 3.5mm they are in between 2.5-3mm for the head screws and 2-2.5mm for the backplate. The tonys screws kit for nova engines doesnt fit either. Could they be us standard sizes?

2.6mm and 3.75mm

Sure on the butt plate size and pretty sure on the head

Is there a way to confirm that? I have no special tools calipers or anything. I didnt bother contacting nova they wouldnt tell me a thing im sure and it would take a month for a response

RB has the complete hex screw set pre-packaged.
Here is a link to the hex screw set,

http://www.amainhobbies.com/product_...ckplate-Screws