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10-10-2011, 05:20 PM
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ATV Enthusiast
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Member #15075
Join Date: May 2011
Location: Louisiana
Posts: 66
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Carb Jetting
I have a HMF Iron Man exaust.. My bike is stock besides that, I have a jet kit on the bike right now and it runs good but It pops and I was wondering if that's good and I also with that exhaust what size jet is recommended for that type of exhaust?
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10-11-2011, 05:33 PM
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Junior Member
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Member #18462
Join Date: Sep 2011
Posts: 28
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Hello!
When you say it pops, is this symptom when on the throttle, on decel, all the time? Are you smelling unburnt fuel? What does your plug look like? Is your valve lash correct?
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2005 Predator 500 TLD K&N Dyno Jet Pro Armor
2007 Predator 500 CUSTOM CREATION by REDNECK2725
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10-11-2011, 07:02 PM
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ATV Enthusiast
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Member #15075
Join Date: May 2011
Location: Louisiana
Posts: 66
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When I decelerate
Not sure if I smell unburnt fuel or just the exhaust that barreling out.
I will check my plug soon
What is valve lash?
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10-11-2011, 07:37 PM
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Junior Member
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Member #18462
Join Date: Sep 2011
Posts: 28
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Guys feel free to step in and correct me if I'm wrong but just about every atv/ dirt bike I've ever owned popped a bit on decel when tuned right. It's just that little bit of unburnt fuel from throttle burning in the hot exhaust pipe. Is it affecting performance? I guess it all depends on how much its popping. If I had to guess I would say that mine pops 2 times between full throttle on its way down to idle. Im no expert on this by any means. Valve lash is the clearance between the cam lobes and the valve bucket when piston is at top dead center. Valvecover has to come off to check this. I wouldn't go that far until I checked compression and I would only do that for a low power or smoking issue. I think you are okay unless you are noticing power or performance issues like bogging or missing.
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2005 Predator 500 TLD K&N Dyno Jet Pro Armor
2007 Predator 500 CUSTOM CREATION by REDNECK2725
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10-11-2011, 07:50 PM
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Junior Member
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Member #18462
Join Date: Sep 2011
Posts: 28
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ATV Carburetor Jetting Instruction - ATV Technical Articles
Here's a little guide to jetting, but just an introduction. I think you prob have a .165 or .155 main jet now. The only way to know for sure is to pull it and read the number.
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2005 Predator 500 TLD K&N Dyno Jet Pro Armor
2007 Predator 500 CUSTOM CREATION by REDNECK2725
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10-12-2011, 05:05 AM
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ATV Enthusiast
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Member #15075
Join Date: May 2011
Location: Louisiana
Posts: 66
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No
The bike has no lack of power at all
It's about like yours, it'll pop about twice during decel
I wanted to hear it from someone who knew, I don't know much about jetting
I bought the bike from a guy who already jetted it.
I'm gonna pull it off and take a look soon as I get a chance
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10-15-2011, 01:06 PM
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Extreme ATV Enthusiast
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Member #13071
Join Date: Mar 2011
Location: Carsonville
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exhaust popping on decel is usually from either a few things. cold air getting into your exhaust either a leaking exhaust flange or gasket. my race build pops twice every time i go from full throttle to closed every time. i wouldnt worry to much about it as long as your plug looks good.
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04 Polaris predator 558 Flat track quad
04 Polaris predator 500 trail build(in the works)
started life as a replacement frame so a ground up build
Build predator and outlaw lowering kits
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10-28-2011, 05:42 AM
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ATV Enthusiast
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Member #15075
Join Date: May 2011
Location: Louisiana
Posts: 66
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Pulled my plug off yesterday and it looked like it is burning fine, it was probably the original so I changed it
Thanks for y'all help and advice
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