No power - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

Sideline · 12-20-2012, 08:42 PM

Hi, I have a foreman 450s and it's hard to start, when it does eventually starts it has no high end power and it takes a few seconds to get up to high rpm(this is when in neutral) it is hard to make it move itself when in gear. I bought a new carb and set it to where the book told me and changed the air filter, spark plug, fuel, and muffler and there is still no change. I did a compression test and I got 50psi. I also noticed that when it does run and I give throttle the exhaust pipe at the front glows red. Does anybody have any suggestions on this problem I have. Thanks.

texas30cal · 12-21-2012, 01:34 AM

Is it a Kei-Hin carb or a chinese copy off of ebay? Does the choke help it rev up better? Check the valve lash. The pipe glowing is usually a indication of a lean condition, unless you have been running it pretty hard.

scottl1346 · 12-21-2012, 01:56 AM

50 psi on a compression test is no good

Sideline · 12-21-2012, 01:35 PM

It is a Kei-Hin carb, bought it from Honda. The pipe was glowing even with the old carb. What is good compression when cranking for these engines? (yes, I did check valve lash and it is within specs)

texas30cal · 12-22-2012, 12:56 AM

That is why I suggested checking the valves. The book says 78 -121 psi compression test, how long did you turn it over when testing? If you remove the rocker cover are both valves moving approximately the same amount?

wydglide · 12-22-2012, 05:29 AM

Quote:

Originally Posted by Sideline

Hi, I have a foreman 450s and it's hard to start, when it does eventually starts it has no high end power and it takes a few seconds to get up to high rpm(this is when in neutral) it is hard to make it move itself when in gear. I bought a new carb and set it to where the book told me and changed the air filter, spark plug, fuel, and muffler and there is still no change. I did a compression test and I got 50psi. I also noticed that when it does run and I give throttle the exhaust pipe at the front glows red. Does anybody have any suggestions on this problem I have. Thanks.

Sideline,
please fill out your profile bud, so we can tell if we have a member in your area......also have you checked the timing
Thanks

temagamiarearider · 12-22-2012, 07:15 AM

its obviously running way lean. i would guess this to be the root cause of the poor compression... assuming all was fine at some point in the engines recent past.

wydglide · 12-22-2012, 08:02 AM

Quote:

Originally Posted by temagamiarearider

its obviously running way lean. i would guess this to be the root cause of the poor compression... assuming all was fine at some point in the engines recent past.

help me here...are you simply saying he has wore rings & maybe leaking valves?

Sideline...is inside the EX pipe BLACK or a gray color?

temagamiarearider · 12-22-2012, 12:55 PM

Quote:

Originally Posted by wydglide

help me here...are you simply saying he has wore rings & maybe leaking valves?

Sideline...is inside the EX pipe BLACK or a gray color?

sorry for the confusion glide. the fact its dangerously lean is evidenced by the glowing exhaust header. this likely burned his valves and resulted in poor compression.... Im guessing.

wydglide · 12-22-2012, 02:20 PM

Quote:

Originally Posted by temagamiarearider

sorry for the confusion glide. the fact its dangerously lean is evidenced by the glowing exhaust header. this likely burned his valves and resulted in poor compression.... Im guessing.

understood....But timing will do the same thing!

12-20-2012, 08:42 PM	#1 (permalink)
Sideline Honda Rider Join Date: Dec 2012 Location: southern, Ontario, Canada Posts: 10	No power Hi, I have a foreman 450s and it's hard to start, when it does eventually starts it has no high end power and it takes a few seconds to get up to high rpm(this is when in neutral) it is hard to make it move itself when in gear. I bought a new carb and set it to where the book told me and changed the air filter, spark plug, fuel, and muffler and there is still no change. I did a compression test and I got 50psi. I also noticed that when it does run and I give throttle the exhaust pipe at the front glows red. Does anybody have any suggestions on this problem I have. Thanks.

12-21-2012, 01:34 AM	#2 (permalink)
texas30cal Honda Rider Join Date: Oct 2012 Location: Brenham, Tx Posts: 95	Is it a Kei-Hin carb or a chinese copy off of ebay? Does the choke help it rev up better? Check the valve lash. The pipe glowing is usually a indication of a lean condition, unless you have been running it pretty hard. __________________ 98 450 es 2-02 cannondales 86 atc 200x 83 alt50

12-21-2012, 01:56 AM	#3 (permalink)
scottl1346 Honda Red Wing Rider Join Date: Apr 2009 Location: mass Posts: 2,207	50 psi on a compression test is no good __________________ 02 foreman 450 ES 2 inch HL lift kit super ATV front disk brake 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

12-22-2012, 12:56 AM	#5 (permalink)
texas30cal Honda Rider Join Date: Oct 2012 Location: Brenham, Tx Posts: 95	That is why I suggested checking the valves. The book says 78 -121 psi compression test, how long did you turn it over when testing? If you remove the rocker cover are both valves moving approximately the same amount? __________________ 98 450 es 2-02 cannondales 86 atc 200x 83 alt50

12-22-2012, 07:15 AM	#7 (permalink)
temagamiarearider Honda Red Wing Rider Join Date: Sep 2008 Location: West Nipissing, Ontario Posts: 579	its obviously running way lean. i would guess this to be the root cause of the poor compression... assuming all was fine at some point in the engines recent past. __________________ 2007 Honda Rubicon CTE 2010 Can Am Outlander 800R XT

12-21-2012, 01:35 PM	#4 (permalink)
Sideline Honda Rider Join Date: Dec 2012 Location: southern, Ontario, Canada Posts: 10	It is a Kei-Hin carb, bought it from Honda. The pipe was glowing even with the old carb. What is good compression when cranking for these engines? (yes, I did check valve lash and it is within specs)

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