Falls on its face under acceleration - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

mokanrancher · 01-19-2012, 09:59 AM

I've been having a low power problem for a while. Not real bad but noticeable. So I had some down time and I decided to do the lemon juice carb clean (which worked well). I reassembled eveything last night per factory specs and know I have a VERY sluggish acceleration and it pops at full throttle. But has a very nice idle quality. Any thoughts?

sspeckerwood · 01-19-2012, 10:06 AM

welcome to the forum. did you make sure your air/fuel mixture was at factory 2 5/8 turn.
and then if needed adjust from there. thats a good start from there

chrisb · 01-19-2012, 10:09 AM

Might sound silly but did you check your air filter

rich450es · 01-19-2012, 10:16 AM

did you line up the little tab on the rubber diphram on the top of the carb right (will cause slugish acceleration because of leak)

mokanrancher · 01-19-2012, 10:56 AM

I set pilot at 2 5/8 and and Im running the airfliter straight off of carb (air box cracked, new one on order). The rubber diaphram was hard to get to stay seated so that might be the problem. I'll check it tonight. Why would you ever need to adjust pilot jet? Thanks for all the help.

chvy=power · 01-19-2012, 01:07 PM

pilot jet and pilot screw control idle to 1/4 throttle...the needle slide, diaphram, needle taper, needle position, and needle jet control ~ 1/4 to 3/4 throttle. and the main jet controls full throttle. Some overlap each other but that is the basics to know when trouble shooting a carb. Someone correct me if i missed somethin

mokanrancher · 01-19-2012, 01:18 PM

Thanks for the clarification. I'll update with my findings.

mokanrancher · 01-20-2012, 10:34 AM

Got home last night and drained the tank and float bowl. Fuel did'nt look bad but flushed it anyway. Added fresh fuel with Seafoam. Removed top carb plate and sure enough the diaphram was installed incorrectly. Reinstalled and reassemled. Runs great. Also moved slide needle to lowest position to see if that helps low end pull. Too cold to ridelast night, but I'm hoping that it will do good under a load. Thanks for yalls help.

mokanrancher · 01-24-2012, 11:42 AM

Well it ran pretty good most of the weekend and then on Sunday it didnt want to idle and seemed to be lacking power a bit (my buddies 300 left me in his dust!!). So I pulled carb back apart and found a little debris in bottom of float bowl. Cleaned again and I'm considering performing carb mod (drill out slide). I'll reassemble tonight and try it. What recomendations about weak top end? I'm getting all kinds of s**t about this bike being slow.

rich450es · 01-24-2012, 11:47 AM

yes the foreman 450 is slow , there not designed to go fast . there designed to work !

01-19-2012, 09:59 AM	#1 (permalink)
mokanrancher Honda Rider Join Date: Feb 2010 Location: Lawrence, Ks Posts: 12	Falls on its face under acceleration I've been having a low power problem for a while. Not real bad but noticeable. So I had some down time and I decided to do the lemon juice carb clean (which worked well). I reassembled eveything last night per factory specs and know I have a VERY sluggish acceleration and it pops at full throttle. But has a very nice idle quality. Any thoughts?

01-19-2012, 10:06 AM	#2 (permalink)
sspeckerwood Honda Red Wing Rider Join Date: Dec 2010 Location: tooele, ut Posts: 8,679	welcome to the forum. did you make sure your air/fuel mixture was at factory 2 5/8 turn. and then if needed adjust from there. thats a good start from there __________________ 2012 TRX500FM FOREMAN. SSPECKERWOOD 3RD HEADLIGHT MOD QUAD BOSS REAR SEAT 26" SWAMPLITES KFI #3000 WINCH HOT GRIPS HEATED GRIPS & THUMB WARMER HONDA ALUMINUM A-ARM GUARDS 00' FOREMAN 450es HIGH LIFTER SPRINGS FRONT & REAR MAXXIS TIRES OFF A 2012 FOREMAN 500 SSPECKERWOOD 3RD HEADLIGHT MOD http://www.flickr.com/photos/sspeckerwood/ http://www.youtube.com/user/sspeckerwood Official hondaforeman.com stickers IF YOU WOULD LIKE OFFICIAL HONDAFOREMAN.COM STICKERS PM ME.

01-19-2012, 10:16 AM	#4 (permalink)
rich450es Honda Red Wing Rider Join Date: Nov 2010 Location: ludlow,mass Posts: 10,524	did you line up the little tab on the rubber diphram on the top of the carb right (will cause slugish acceleration because of leak) __________________ 2000 foreman 450 es-s the fking pig 14% 300 foretrax gear reduction 30in gorila silverbacks on C-5 wheels 2500lb warn winch superatv disk brake conversion kit 2in ssatv lift kit and progressive 512 shocks the original 4in PVC storage tube hurculined racks with rear cargo box czr loud exhaust , uni airfilter and drilled main jet foreman 450 parts for sale pm me for info**

01-19-2012, 10:56 AM	#5 (permalink)
mokanrancher Honda Rider Join Date: Feb 2010 Location: Lawrence, Ks Posts: 12	I set pilot at 2 5/8 and and Im running the airfliter straight off of carb (air box cracked, new one on order). The rubber diaphram was hard to get to stay seated so that might be the problem. I'll check it tonight. Why would you ever need to adjust pilot jet? Thanks for all the help. __________________ 99 Foreman stock 03 Rancher

01-19-2012, 01:07 PM	#6 (permalink)
chvy=power Honda Rider Join Date: Dec 2011 Location: Spartanburg, SC Posts: 24	pilot jet and pilot screw control idle to 1/4 throttle...the needle slide, diaphram, needle taper, needle position, and needle jet control ~ 1/4 to 3/4 throttle. and the main jet controls full throttle. Some overlap each other but that is the basics to know when trouble shooting a carb. Someone correct me if i missed somethin __________________ 2000 Silverado 1500 Z71 -5.7L ls1 -milled 243 heads -ls6 intake -Custom grind cam 226/230 .598/.600 111+2 -full bolt ons -4L65e trans w/2800 stall -4.11 gears with detroit lockers 2007 Foreman 500 ES 4x4 - 25" Artrax's wrapped around 12" STI HD2's - 506.5cc Big Bore Kit -dynojet jet kit -hmf swamp series -uni airfilter -2500lb winch 2006 Rancher 350 ES -Dynojet jet kit

01-19-2012, 10:09 AM	#3 (permalink)
chrisb Honda Lover Join Date: Apr 2010 Location: West NJ Posts: 455	Might sound silly but did you check your air filter

01-19-2012, 01:18 PM	#7 (permalink)
mokanrancher Honda Rider Join Date: Feb 2010 Location: Lawrence, Ks Posts: 12	Thanks for the clarification. I'll update with my findings. __________________ 99 Foreman stock 03 Rancher

01-20-2012, 10:34 AM	#8 (permalink)
mokanrancher Honda Rider Join Date: Feb 2010 Location: Lawrence, Ks Posts: 12	Got home last night and drained the tank and float bowl. Fuel did'nt look bad but flushed it anyway. Added fresh fuel with Seafoam. Removed top carb plate and sure enough the diaphram was installed incorrectly. Reinstalled and reassemled. Runs great. Also moved slide needle to lowest position to see if that helps low end pull. Too cold to ridelast night, but I'm hoping that it will do good under a load. Thanks for yalls help. __________________ 99 Foreman stock 03 Rancher

01-24-2012, 11:42 AM	#9 (permalink)
mokanrancher Honda Rider Join Date: Feb 2010 Location: Lawrence, Ks Posts: 12	Well it ran pretty good most of the weekend and then on Sunday it didnt want to idle and seemed to be lacking power a bit (my buddies 300 left me in his dust!!). So I pulled carb back apart and found a little debris in bottom of float bowl. Cleaned again and I'm considering performing carb mod (drill out slide). I'll reassemble tonight and try it. What recomendations about weak top end? I'm getting all kinds of s**t about this bike being slow. __________________ 99 Foreman stock 03 Rancher

01-24-2012, 11:47 AM	#10 (permalink)
rich450es Honda Red Wing Rider Join Date: Nov 2010 Location: ludlow,mass Posts: 10,524	yes the foreman 450 is slow , there not designed to go fast . there designed to work ! __________________ 2000 foreman 450 es-s the fking pig 14% 300 foretrax gear reduction 30in gorila silverbacks on C-5 wheels 2500lb warn winch superatv disk brake conversion kit 2in ssatv lift kit and progressive 512 shocks the original 4in PVC storage tube hurculined racks with rear cargo box czr loud exhaust , uni airfilter and drilled main jet foreman 450 parts for sale pm me for info**

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