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Post by renagade281 on Jul 21, 2015 18:26:45 GMT -5
Simple question. It used to go up hills fine but since I put new rocker arms on it won't go up them barely
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Post by usmcdoc on Jul 21, 2015 18:46:34 GMT -5
Simple answer.. No Sir.. Valves are ONLY set to compensate for thermal expansion of the metal. The valves expand when hot..and if valve clearance is not set..when the valves expand from heat they will become partially open and not seal. So you lose some or all power. So again..no...valve setting will only affect power if they are set too tight that when the valves expand..they no longer seal correctly..and you will LOSE power. Btw..I saw your last few posts..STOP over tightening the valve adjustment nut and bolts.. Keyword is 'snug'..not torqued as tight as you can get them.. Glenn
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Post by renagade281 on Jul 21, 2015 19:46:08 GMT -5
Lol. I got it now. It just seems to have less power going uphill than it did before I changed rocker arms
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Post by scooternub on Jul 23, 2015 7:05:40 GMT -5
Simple answer.. No Sir.. Valves are ONLY set to compensate for thermal expansion of the metal. The valves expand when hot..and if valve clearance is not set..when the valves expand from heat they will become partially open and not seal. So you lose some or all power. So again..no...valve setting will only affect power if they are set too tight that when the valves expand..they no longer seal correctly..and you will LOSE power. Btw..I saw your last few posts..STOP over tightening the valve adjustment nut and bolts.. Keyword is 'snug'..not torqued as tight as you can get them.. Glenn are we suppose to adjust the valves while engine is hot, cold or warm?
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Post by usmcdoc on Jul 23, 2015 7:29:43 GMT -5
Simple answer.. No Sir.. Valves are ONLY set to compensate for thermal expansion of the metal. The valves expand when hot..and if valve clearance is not set..when the valves expand from heat they will become partially open and not seal. So you lose some or all power. So again..no...valve setting will only affect power if they are set too tight that when the valves expand..they no longer seal correctly..and you will LOSE power. Btw..I saw your last few posts..STOP over tightening the valve adjustment nut and bolts.. Keyword is 'snug'..not torqued as tight as you can get them.. Glenn are we suppose to adjust the valves while engine is hot, cold or warm? COLD...as in sitting several hours!!
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Post by derbiman on Jul 23, 2015 8:06:57 GMT -5
The engine is basically an air pump. If the valves are not adjusted properly,it will not pump air efficiently. A valve adjustment will not give you more power,it will optimize the power available.
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Post by scooternub on Jul 23, 2015 8:21:54 GMT -5
are we suppose to adjust the valves while engine is hot, cold or warm? COLD...as in sitting several hours!! so .003 for intake and .004 for exhaust, cold. i have to readjust my valves. my mechanic used .007. dunno if he did it cold, warm or hot.
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Post by derbiman on Jul 23, 2015 9:24:53 GMT -5
Yes, adjust them while the engine is cold..007 is too much!!! At that setting, the valves are not opening enough and you probably have some tapping coming from the valve cover area..003 to .004 is ideal.
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Post by scooternub on Jul 23, 2015 9:48:05 GMT -5
removed. posted wrong thread.
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Post by derbiman on Jul 23, 2015 10:01:19 GMT -5
You would have to convert the 15kg/cm2 to standard psi because all of the numbers are metric. Normal psi for a gy6 4 stroke engine should be around 150 to 170 psi. The conversion that is given on the engine manual that you posted is 213 psi which is extremely high.
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Post by usmcdoc on Jul 23, 2015 10:17:41 GMT -5
You would have to convert the 15kg/cm2 to standard psi because all of the numbers are metric. Normal psi for a gy6 4 stroke engine should be around 150 to 170 psi. The conversion that is given on the engine manual that you posted is 213 psi which is extremely high. yeah..wow..I just converted 15kg/cm2 to psi and it is 213.3 ! A bit high and I have NEVER seen even a fresh new engine run that high. In fact many big bore kit companies say to keep psi below 210 psi. In fact..one BBK 52mm..that I did for a guy..it was running 190 psi and the starter could not even turn it over..
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Post by renagade281 on Jul 23, 2015 10:18:37 GMT -5
So besides a Bbk , what can I do to get just a little more power/speed
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Post by derbiman on Jul 23, 2015 10:33:18 GMT -5
There is no replacement for displacement!!! Do the bbk. You will not regret it. The best plug and play set up that I have used is the Power Pack kit from Environmoto.It is a 72cc kit that takes all of the guess work out of tuning. Includes a Uni filter,carb jet,roller weights, fuel filter, spark plug, cylinder with piston and pin. Just install and ride.
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Post by Florida Antique on Jul 23, 2015 10:45:21 GMT -5
So besides a Bbk , what can I do to get just a little more power/speed It depends on how fast it is now. If it will only do 25~30 mph, the CDI may be restricted. It may also have a spacer in the variator. If it will run 37~40 mph, there probably is no restrictions and the only thing you can do is unbolt the seat, place a 150cc scooter underneath it a bolt the seat to the 150cc scooter. AFAIK for horsepower, there is no substitute for displacement. If you want more horsepower, you need more displacement. BBK increases displacement from 49 to 74~80cc. The only other way to increase displacement is to increase pressure at the intake. That's what turbocharging/supercharging does. Big bore kit is much easier and cheaper way to go IMHO.
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Post by renagade281 on Jul 23, 2015 18:47:06 GMT -5
It tops out at about 29-30 mph. But I just went up a hill and was doing like 5mph. It was embarrassing
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