No power - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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Old 12-20-2012, 08:42 PM   #1 (permalink)
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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.
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Old 12-21-2012, 01:34 AM   #2 (permalink)
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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.
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Old 12-21-2012, 01:56 AM   #3 (permalink)
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50 psi on a compression test is no good
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Old 12-21-2012, 01:35 PM   #4 (permalink)
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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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Old 12-22-2012, 12:56 AM   #5 (permalink)
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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?
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Old 12-22-2012, 05:29 AM   #6 (permalink)
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Quote:
Originally Posted by Sideline View Post
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
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Old 12-22-2012, 07:15 AM   #7 (permalink)
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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.
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Old 12-22-2012, 08:02 AM   #8 (permalink)
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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?
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Old 12-22-2012, 12:55 PM   #9 (permalink)
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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.
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Old 12-22-2012, 02:20 PM   #10 (permalink)
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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!
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