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Old 11-05-2009, 06:21 PM
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Default New Engine Mods

I have modified honda gx 160 and i'm looking to take it to the next step. These are mods that i have done:

governoer removal
gx 200 head gasket
smaller fan
bored out gx 160 carb
1.2 rocker arms
billet reatiners and keepers
stainless valves
8 of advance timing
header
diamond spark plug
18 lb springs

i have a 2 speed jack system in place and i would to achieve more torque and mid range power. i wanna be i able to "loosen the back end". i was think a better cam and gx 390 carb and flat top piston and arc conecting rod and springs? i wannaspend close $150 to $200. thanks
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Old 11-05-2009, 06:56 PM
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that would work you'd need more rpm to loosen the tires but what size are they btw
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Old 11-05-2009, 07:05 PM
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minkuni would be better than a gx carb
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Old 11-05-2009, 07:41 PM
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the tires are 16inch trailer tires and i hear minkuni carbs are hard to tune and they require a fuel pump right? would the power from that carb be that much better then a gx390?
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Old 11-05-2009, 07:46 PM
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thats alot of timing on that GX160..

add a cam.. shave head the .010 gasket helps but you caould take .05" off the head too

gx390 carbs I hear are good too.. mikuni will help the motor SING
my thoughts are that if you didnt port the head and/or add bigger valves you may not see much performance gain.. you MAY lose bottom end actually

cam 109 bux
shave head.. ($50??)
or switch to alky!!!! since you have alot of timing in that motor. GX160 run 4 deg advanced over a gx200
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Old 11-05-2009, 08:01 PM
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any cam recommendations? and i did port the head and the 0.010 gasket. how hard is to set up mikuni with a fuel pump? and is it worth it?
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Old 11-05-2009, 09:12 PM
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fuel pump VERY simple. since you will need to add an intake buy the one that has a pulse fitting in it
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Old 11-05-2009, 10:15 PM
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Do you need a fuel pump if the fuel tank is mounted above the mikuni? I guess a better question is how many psi does the mikuni need?
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Old 11-05-2009, 10:24 PM
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it has a fuel bowl so I would think Gravity will be OK
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Old 11-05-2009, 10:28 PM
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Quote:
Originally Posted by 1992suburban View Post
it has a fuel bowl so I would think Gravity will be OK
gravity is indeed ok... never had a gas issue with my previous design of gravity feed
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Old 11-06-2009, 11:50 AM
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thats amazing and saves me some cash.thanxs
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Old 11-06-2009, 12:12 PM
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Quote:
Originally Posted by 1992suburban View Post
thats alot of timing on that GX160..

add a cam.. shave head the .010 gasket helps but you caould take .05" off the head too

gx390 carbs I hear are good too.. mikuni will help the motor SING
my thoughts are that if you didnt port the head and/or add bigger valves you may not see much performance gain.. you MAY lose bottom end actually

cam 109 bux
shave head.. ($50??)
or switch to alky!!!! since you have alot of timing in that motor. GX160 run 4 deg advanced over a gx200
how would he switch to alcohol?
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Old 11-06-2009, 01:26 PM
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low speed jet and main change...

with 8degrees advanced higher compression he might as well..
methonal
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Old 11-06-2009, 04:04 PM
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That's kool you guys should make a write up on this
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Old 11-09-2009, 10:57 AM
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umm two things. i have this unusual problem that no one has been able to help me with. my engine does not want to idle when the choke is completely off. i have to heel and toe the gas to keep it running with the choke half off or completely off. is this normal? also i am looking buying gx390 or a 25mm mikuni. does anyone have pictures of how they set up the throttle control and adapter for gx390 carb and mikuni? thanxs. any info would be a great help! oh does the mikuni have to be connected to a pulse fitting if its gravity fed? don't really understand how that system works. i'm doing research though lol. thanxs again.
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Old 11-09-2009, 01:41 PM
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Mikuni can be gravity fed
GX390 throttle should hook up like the GX160 did.
Stout Racing.. Google him hes the man he can hook you UP

I think the carb is dirty or you have a vacuum leak, and or Idle set to low
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Old 11-09-2009, 04:40 PM
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If you want to run Gravity feed you will need a larger Needle and Seat assembly.
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Old 11-09-2009, 05:07 PM
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Quote:
Originally Posted by jr dragster Tyler View Post
If you want to run Gravity feed you will need a larger Needle and Seat assembly.
why? the float should do the work right???
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Old 11-09-2009, 05:13 PM
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The float just floats....The needle and seat shut the fuel off. If the needle and seat is sizes 1-1.8 or so its designed for a pump setup. 1.8-3 is ment for gravity feed.
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Old 11-10-2009, 12:46 PM
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looking gettin .265 cam from stout. good for the mods i got?
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