Carb Adjustment 99 450ES - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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post #1 of 24 (permalink) Old 12-03-2011, 09:54 PM Thread Starter
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Carb Adjustment 99 450ES

99 TRX 450 ES

I just overhauled the carb with a new Moose Kit - 130 Main / 45 Slow jet / Needle at 3rd etc.

Can someone provide me some basic carb tuning instructions ? I have played with the Slow jet starting at 2.75 turns and going in an out and it's not running well in the 25-50% range with an ocational backfire through the carb.

What all can I try ? This machine is new to me --- so I would not rule anything out ... valve adjustment needed etc....

Thanks
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post #2 of 24 (permalink) Old 12-03-2011, 10:02 PM
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the air/fuel mixture screw should be 2 5/8 turns out.

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2 inch HL lift kit REMOVED
super ATV front disk brake conversion
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post #3 of 24 (permalink) Old 12-03-2011, 10:14 PM
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yup base line is 2 5/8 turns out but i think the carb is still dirty . how did you clean it ? with just carb clean ? did you blow all the pasages with compressed air ?
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post #4 of 24 (permalink) Old 12-03-2011, 11:13 PM Thread Starter
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Carb

The Carb was clean when I got it from ebay. I still dunked it in carb cleaner -- the gallon can from autozone, and then ran Gumout through it, and used compressed air. The I added all the new brass from the kit with all new jet needles, jets, seals, ect.

This puppy (carb) is clean ---- still backfires thou.

Should I move the Jet Needle setting to one more richer ?

Thanks.
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post #5 of 24 (permalink) Old 12-03-2011, 11:52 PM
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Does it run better if you apply the choke some? If so raise the needle a notch and see what it does.



2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
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post #6 of 24 (permalink) Old 12-04-2011, 02:51 AM
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are you sure the problem is with the carb and not a loose header nut, bad header gasket, crack in the pipe or loose/rotted baffles in the exhaust?

02 foreman 450 ES
Wiseco high comp piston
2 inch HL lift kit REMOVED
super ATV front disk brake conversion
Super ATV Rear disc conversion
27" zillas on OEM wheels
14% gear reduction
HMF ECO system exhaust
diamond plate bash plate and cv boot guards
Super-winch 2500lb
custom LED brake lights
fan switch mod
rear progressive 512 shocks
100w shark audio system
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post #7 of 24 (permalink) Old 12-04-2011, 08:40 AM Thread Starter
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Carb

The exhaust does sound louder than normal like it needs "repacked". It does push alot of air through it if you stand behind the muffler.

What can I try to be sure I need the muffler fixed / replaced ?

Why would a restrictive muffler cause a backfire through the rear of the carb ?
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post #8 of 24 (permalink) Old 12-04-2011, 01:43 PM
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are you running a stock or aftermarket exhaust. take a small hammer and tap the outside of the exhaust if you hear thing moving around or rattling then its bad. stock exhausts cant be repacked theres nothing in there but baffles. it causes backfiring because there no back pressure and it makes it run really lean condition

02 foreman 450 ES
Wiseco high comp piston
2 inch HL lift kit REMOVED
super ATV front disk brake conversion
Super ATV Rear disc conversion
27" zillas on OEM wheels
14% gear reduction
HMF ECO system exhaust
diamond plate bash plate and cv boot guards
Super-winch 2500lb
custom LED brake lights
fan switch mod
rear progressive 512 shocks
100w shark audio system
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post #9 of 24 (permalink) Old 12-05-2011, 04:02 PM
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All foremans push lots of air out the back. I'd do the exhaust check but a lot more gremlins to be found by trouble shooting the carb

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post #10 of 24 (permalink) Old 12-10-2011, 05:36 PM Thread Starter
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Here's where I am. I ran the bike until warm and kept the choke on 100%. The Bike runs great with no backfire in carb or exhaust upon acceleration or deceleration. I can hold it full throttle and it appears to be hitting a rev limiter, if it has one. At full throttle is appears to be "bogging" a bit. The bike idles fine with full choke. I probaby could easily have a great ride using it in this condition.

When I take the choke off, I get the backfires starting in the carb and exhaust. Every minute or so at idle -- the engine dies like it was starving for air/gas.

Should I clean this carb once again and place the old "Honda" Brass back in afterward ? I am not sure how good the new Moose Carb kit is ?

Shoudl I raise the needle one notch first ?
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