[Bigvick]

I put the performance kit from HMF on my 500S (slip-on, 170 main j., 2 1/2 turns out on a/f screw. Last night me and my wife were riding around on my parents place and she said that about 2 or 3 times when I changed gears she saw a small puff of grey smoke come out the exhaust. She said it was just a very small amount and if she wasn't looking right at the exhaust she probably wouldn't have noticed. My question is could this be a little unburnt fuel or could it be too lean? I believe it was only doing it at higher rpm and when I swapped gears. Not worried about it too much just wondering. Thanks everybody!

 

[Bigvick]

I did the plug test when I first put the kit on couple weeks ago. I went down my driveway (about 75 yards) in 3rd gear wound up tight then shut it off and took the plug out. It was all black except right around the base of the center electrode(the end of the ceramic at the electrode), it was a tan color. Done this several times with the same results. I was just wondering what the smoke could be, its very little, not much at all. You will see it barely at the end of the exhaust and thats it. By the time you see it it's already gone if you know what I mean.

 

[Bigvick]

Thats a good possibility. On the way down to my parents house it poured the rain and I didn't have the plug in the exhaust, so maybe the packing got wet.

 

[Bigvick]

QUOTE ("big_daddy_bigfoot":2m5nucna)

QUOTE ("Bigvick":2m5nucna)

Thats a good possibility. On the way down to my parents house it poured the rain and I didn't have the plug in the exhaust, so maybe the packing got wet.

Plug? Are you supposed to plug it when transporting it?[/quote]


Yeah, I got in a hurry loading it and forgot to plug the exhaust. Didn't realize it untill I got there.

I don't get any blue flames! Matter of fact mine doesn't cough or backfire at all. If you wind it up tight then let off it's just a nice smooth purr until it idles.

 

[Bigvick]

QUOTE ("rovmike":2cj2r10b)

I'm about to put the same set up on my 500, (HMF,Dynojet,K&N)......my question is how much power gain did you notice? Was it just a little bit, or a HOLY $&[email protected] thats a lot faster?? I'm going to be adding the quite core insert as well, will that decrease the amount of power I'll be gaining? Thanks guys

Well with mine it was more like a "Dang, That's pretty good!"
You will see a power increase, it was very good improvement on mine.
I feel more low end torque rather than top end and thas what I wanted. Adding the quiet core will take some away but not sure on how much. Maybe someone with the q. core could answer that better.