FUEL INJ. 420/ with pipe but no programmer - Honda ATV Forum
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post #1 of 3 (permalink) Old 10-09-2010, 09:59 AM Thread Starter
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Location: Montana
Posts: 101
FUEL INJ. 420/ with pipe but no programmer

Hey everyone.. Is it possible to run just a pipe and no programmer on a FI 420..?? I know they run rich out of the crate to begin with.. I live at high elevation so I do need to run it on the lean side.. I also have a uni filter and 1.5" snorkle.. I know someone that said he gets better performance from a 2" snork and just a pipe than what he got from a 1.5" snork, pipe, and programmer??? Is the old spark plug look test the way to go.. If i'm still running rich after the snork and uni, maybe getting a pipe and running it for a bit, then check it...???? i DONT want to run too lean as that might hurt the engine.. But I dont want to waste $ on programer.. I know the pcIII lets you take away fuel, but for the $ i want it to make a large difference.. Not gonna get one if it wont count!!

09 Rancher 420 AT IRS/FI "RANCHZILLA"
14" ITP SS 312 wheels
27" maxxis zillas
Custom 1.5" snorkel(now removed)
UNI filtered
2000lb xtreme winch (front)
3000lb viper winch (rear)with quick release
Extra front riding lights
Kolpin hand guards with mirrors
ACC plug
Fender bags

05 Vinson 500 viper 3000lb winch

2012 kawasaki brute force 750i EPS
currently stock
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post #2 of 3 (permalink) Old 10-09-2010, 11:50 AM
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Location: Central Louisiana
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Try it and let us know....
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post #3 of 3 (permalink) Old 10-09-2010, 01:49 PM
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Location: Pickardville AB, CA
Posts: 64
The canned tune for my Power Commander with the HMF pipe pulls a lot of fuel out of the engine throughout the band. There is richening as well but it is not significant. I wouldn't hesistate to add the exhaust but honestly the programmers added throttle response is nice on it's own. If it were my quad I would buy the programmer before the exhaust. I am running my stock pipe for now because of HMF's screw up and you can feel a difference at the top end, but the throttle respsonse and low end power are better than it ever was stock.
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