I c so it make sense to lean the hsn first since it leans the lsn? Starting off with a rich stock setting?

I just read that novarossi you run the lsn first? If I do the lsn first then lean the hsn then go fine tune the lsn?

When I'm in pit lanes I hear ppl say lean my bottom out etc...is that ok if they don't richen the hsn?

Thanks

Can you break in a engine in the winter time or wait for warmer temps.

yes. wrap tin foil on head and moniter temps....

Speaking of winter....should I go from a P3 to a P4 glow plug if I am racing in temps below 50 degrees? What is a good rule of thumb? Should I change Nitro % from 30% to less as well?

A p4 would be cooler than a p3. I wouldn't change a thing. You may have to richen up your needles a bit for the air temp but that's it...

A P4 is a hotter plug then the P3..... If its Cold out the P3 will be fine. ON the very hot and humid days, the P4 will shine.

Actually P3 is indeed hotter then P4

Well than I have been mislead.....

its all kind of misleading as some plugs that are rated to be a "hotter" range actually work as if they are of a "cooler" range , many designs of plugs and thats why they all act differently . there is the metals used in the filament wire and the size of the orifice , these things are huge in how the glow plugs run .

and most all plug manufacturers rate there plugs from hot to cold by lower numbers to higher numbers

hope this helps a little guys


heres a little experiment for ya , dont touch a needle on your engine while doing this

start wherever you like in the heat ranges and brands , get engine up to temp , run it for a few minutes on the street , varying throttle but not necessarily WFO , now bring it in , switch plugs go do similar throttlings , repeat this process over and over with all differrent plugs , make notes or wtvr on how each plug effects the tune you never touched that was hopefully good to race with in the first place . you will see a correlation between the cold plugs and how they act , hot plugs and how they act and so on and so on

Quoting an old post here, but when pinching the fuel line how far away from the carb should you pinching? Obviously the farther away from the carb, the more fuel will be in the lines to run and that can throw off the timing of the pinch test.

Thanks.

Novarossi 21-5K. Engine starts up fine. runs good on the bottom and decent top. I noticed that once it warms up, when we bring it in, the idle is very high. to the point where the clutch is engaging. temps are in the range of 215-230. can anyone give some direction?

No leaks in fuel line or tank.
Idle gap is set @ .5 or so. This was set without the venturi.
All gaskets are new.

Thank you

Found the same problem today on one of my mills. I'm thinking a bad front bearing, the seal on it. That is where I would check. You can spray wd-40 behind the fly wheel when it's at idle to be sure. It should change the idle if not kill the engine if it's leaking...

Wow, Houston, really this is a great article. Really this is a perfect guide for everyone. I really appreciate you on this step by step guide. Thanks for sharing this nice post. Please keep it up.

How do you know for sure that balance between the HSN and LSN is right?

My mate and I have the same car, engine, clutch, plug, fuel but our motors are tuned different. His is leaner on the bottom and richer on the HSN. Mine is richer on bottom and leaner on top. Both engines run around 100-105°C after a 15min main.

Mine has a high idle for about 16-18 seconds and then drops to a lower idle. The engine responds very well on the box. The tires balloon almost immediately.

Pull the trigger nice n slow from fully closed on the slide barrel to fully open , there shouldnt be any major hesitation or an "unsmooth" / "hiccup" anywhere in the throttling. Only nice smooth transitions from bottom to top

Dont bother with the pinch test , use the 20sec idle test