440 guys does your do this?

[Speedy81304]

Ok i have built a 440 with hot cams stage 2 12.5:1 piston. i broke her in by the book. well i started to rev it out a bit and she puffs alittle smoke when i shift. there only 2 hours on the new rebuild.
I heard this could be normal.

Carb setup is a little rich so i can run on pump gas.
42 pilot jet
4 clip down on needle
200 main. dark brown on the plug with this setup.

o also the head was rebuilt with new seals.

[jak1389]

yes it is normal during break-in because the rings havent fully seated yet. after a while, if it keeps blowing smoke, then time to tear it down again and put some new rings on there.

[Speedy81304]

well i work at a honda dealer. and never had a new motor blow smoke. but then again these are stock bore motors. could it be that because the new rings have like a chrome finish wear stock rings are just plan steal.

[K_Fulk]

I think your just way too rich.

[Speedy81304]

my plug looks good. yes i have it alittle on the rich side only because wiseco told me i had to run on race gas or have it setup alittle richer then normal for pump gas. also running a 190 main it was burning white on the plug witch is too lean.

[K_Fulk]

I guarantee if you get it dynoes tuned with a niffer they will tell you to drop it a lot.

[Speedy81304]

maybe ill have to do that sometime. for now ill put the 190 main jet back in and run it for a little bit.

[Mobile Dyno]

Your mainjet is WAY to Rich:eek2: Go with a 175 main. I broke my 440 in on my dyno and I'm running a 170 Dynojet main and I'm at 312ft elevation. Thats most of your problem. Try that.

[Speedy81304]

true i put a 178 in and she rips, the plug still looks white though.
I'm running ultra 94 Gas. But the smocking kinda went away but still happens alittle bit. i'll keep everyone posted on what happens

[Jared Hamilton]

mix oxtainbooster in with your fuel that a way it will not sparknock

[FoxRacing81]

Originally posted by Speedy81304
true i put a 178 in and she rips, the plug still looks white though.
I'm running ultra 94 Gas. But the smocking kinda went away but still happens alittle bit. i'll keep everyone posted on what happens

You're running pump 94 on a 12.5:1 compression piston? I think your just asking for a gernaded motor unless you have something special done.

[F-16Guy]

It shouldn't puff any blue smoke at all. I've never seen a properly built engine (including the ones I've done) emit any blue smoke after the first few seconds of the first startup. If it's black smoke, just lean the main jet down. With a 200 main, that would be my guess. I'm surprised it even runs. Lean it down in to the 170's at least, and run some better fuel. You can't run that big of a bore at 12.5:1 on pump fuel, it just doesn't work. If you can't get race fuel, mix some 100LL avgas (available at just about any small airport) with super. It's a cheaper alternative to race gas, and usually easier to get. DO NOT run octane booster, most of the stuff out there = snake oil. When the bottle says it will raise octane 5 points, it means from 91 to 91.5.

[400exrider707]

Originally posted by F-16Guy
It shouldn't puff any blue smoke at all. I've never seen a properly built engine (including the ones I've done) emit any blue smoke after the first few seconds of the first startup. If it's black smoke, just lean the main jet down. With a 200 main, that would be my guess. I'm surprised it even runs. Lean it down in to the 170's at least, and run some better fuel. You can't run that big of a bore at 12.5:1 on pump fuel, it just doesn't work. If you can't get race fuel, mix some 100LL avgas (available at just about any small airport) with super. It's a cheaper alternative to race gas, and usually easier to get. DO NOT run octane booster, most of the stuff out there = snake oil. When the bottle says it will raise octane 5 points, it means from 91 to 91.5.

Yeah isn't it something like 7 points is one octane rating or something of the sort?? Also I was told that aviation gas wont be nearly as good as race gas because it is made for high elevation and low RPM where as a quad is usually low elevation and High RPMs, makes sense but not sure on how true that is!

[cals400ex]

i thought every point was 1/10 of a number. heck i dont' really know though because i don't use the stuff.

[Loser450]

Originally posted by 400exrider707
Yeah isn't it something like 7 points is one octane rating or something of the sort?? Also I was told that aviation gas wont be nearly as good as race gas because it is made for high elevation and low RPM where as a quad is usually low elevation and High RPMs, makes sense but not sure on how true that is!

I ran AV fuel in my 250R for two hard seasons and never had a problem.

[Speedy81304]

heres the thing, avgas and race fuel is hard to come by where i ride. I put a 185 main. 45 pilot jet, 2 turn on the pilot screw, 3rd clip on the needle. she runs alittle bit rich. wiseco said to run little on the rich side if im not going to run race gas. she rips, no smoke no bogging, pulls hard in every gear. and the off idle throttle is so good. i'm now running ultra 94 with amsoil fuel performance in a 5gal tank. its not an oct booster. its a fuel lube to clean and lube the upper part of the cylinder and valves. once i have 20 hrs on the new topend ill start running the asmoil 10w40 high performance motorcycle oil. witch helps keep things cool and clean.

[F-16Guy]

I guess if you don't have any knocking then you should be okay. In response to an earlier reply; what I heard about AVGAS is that it is comprised of more long-chain hydrocarbons, which help maintain a lower vapor pressure (a requirement in aircraft fuel), but also burn slower. This results in more unburned fuel, which cause people to over-lean their mixture to compensate. I've had good luck running 50/50 with super.

[QuadJunkies]

Originally posted by FoxRacing81
You're running pump 94 on a 12.5:1 compression piston? I think your just asking for a gernaded motor unless you have something special done. WERD!! I have same and I run 50/50 C12!!:eek2:

I had a small amt of smoke when I was breaking in, but was very short lived. I run a 175 main and Im at 2800 elev. I was told by Dunacan to NOT run straight pump with the piston ,so far my mix has worked well.

[Speedy81304]

well guys i started to run 1.5 gal of vp c12 with ultra94.
still gona keep the same jetting. since i'll be running trails and need to keep the cylinder cool. next mounth the engine is getting pulled apart and is going to get blue printed and balanced
and this time head work to match the cam. and a new crf450 carb.

[K_Fulk]

Sounds like she is gonna run good. I just had falicon balance my crank a few weeks ago. They do good work and had a quick turn around time.

[Speedy81304]

it will run good once i get every thing in balance and tuned in..
still it wont be a 450R but i still have Elec start. lol.

[K_Fulk]

You wont be dissapointed. Your 440 should pull like a train from the bottom.