G1 with Enticer 250 Head

ferdabutt · 06-13-2013, 09:40 PM

Ok so i have started this build and its similar to another member here but there are more than one way to skin a cat. So far I've done a complete rebuild on a 82 g1 and there aren't to many original nuts and bolts left... but instead of putting the old head back on i opted to replace it with a Enticer 250 head that I had bored out .02 over. I also threw the old carb out and went with a mikuni VM34-389. now it hasn't been easy jetting this thing out but iam close (still a lil to rich). my current settings are,
Slow Jet: 95
Needle: 6DH4
Needle Jet: N8
Main Jet: 200

The plug is coming out with a nice brown color. I am still running the stock G1 pipe, and yes i know and have heard all the arguments but i need to get the smaller things dealt with before i can play with that. plus i need to find an enticer pipe as well, so if anyone has one, maybe donate for science

... well so far she is running a lot stronger than with the old head but not like she should be... that is where you guys come in with some help. when i am running her there seems to be no difference between lil less than 3/4 and wot. and when she is wot she doesn't sound revved out. anyone have ideas why?

1989Marathon · 06-14-2013, 04:56 PM

It should be very difficult for you to find the top rpm with that motor. If it stops revving around 3/4 throttle, the main jet is probably a bit off. Make sure the air jet on the inlet horn is clean.

ferdabutt · 06-14-2013, 05:11 PM

now that air jet on the horn is it adjustable like the idle screw or is it a fixed thing? read the mikuni tuning manual but it doesn't say much about the air jet

1989Marathon · 06-14-2013, 05:18 PM

The air jet is fixed, just like the other jets. It is not normally changed out. The main jet is usually changed.
Do you have the Mikuni tuning manual specifically for the VM series?

ferdabutt · 06-15-2013, 12:30 AM

this is what my reading material is: http://www.mikuni.com/pdf/vmmanual.pdf

ferdabutt · 06-15-2013, 12:55 AM

Quote:

Where's Marathon when you need him? He had a G1 with a similar carb. Maybe search his threads? He has helped me with mine, but I have a Kehin carb and the jetting sizes are different.

Did you up the main jet until it bogged out? I would go up a few sizes and run it and see how it is. If it boggs out, go smaller until it's right.

Also check your throttle cable and make sure it's opening all the way. Is that a slide carb? Is it vacuum driven or cable driven? I had an atv that had twin mikuni's and the rubber boot around the slide had a small leak in it which caused it not to open all the way.

yeah he seems to be a very wise man and i want to learn as much as i can from him. but its a slide carb that is cable driven and it is setup to pull the whole thing up but its a lil awkward because i had to cut the lil stopper on the back of the pedal and move it closer to the driver so the foots a lil vertical when you first start out... but who drives putting around, pedal to the metal!!! also ill be making a order of a bunch of various jets this weekend but it sucks you can't just return them after you find the magic ones

slonomo · 06-15-2013, 06:24 AM

My pedal is also more vertical than I would like. I was thinking of rigging up some kind of "progressive linkage" to allow a low pedal, but full throttle opening with less movement.

1989Marathon · 06-15-2013, 09:25 AM

Here's a pic of the linkage I made for my old EZGO. I installed a VM series Mikuni. The pedal didn't have enough throw to fully open the throttle, so I made this that had a ratio of about 1.5:1. It worked very well. The top cable came from the pedal. The bottom cable went to the carb.

1989Marathon · 06-15-2013, 09:36 AM

Quote:

Originally Posted by ferdabutt

this is what my reading material is: http://www.mikuni.com/pdf/vmmanual.pdf

That's what you want.

ferdabutt · 06-15-2013, 10:41 AM

looks like i need to invest in some aluminum....

06-13-2013, 09:40 PM	#1
ferdabutt Gone Wild Join Date: Oct 2012 Location: Florida Posts: 206	G1 with Enticer 250 Head Ok so i have started this build and its similar to another member here but there are more than one way to skin a cat. So far I've done a complete rebuild on a 82 g1 and there aren't to many original nuts and bolts left... but instead of putting the old head back on i opted to replace it with a Enticer 250 head that I had bored out .02 over. I also threw the old carb out and went with a mikuni VM34-389. now it hasn't been easy jetting this thing out but iam close (still a lil to rich). my current settings are, Slow Jet: 95 Needle: 6DH4 Needle Jet: N8 Main Jet: 200 The plug is coming out with a nice brown color. I am still running the stock G1 pipe, and yes i know and have heard all the arguments but i need to get the smaller things dealt with before i can play with that. plus i need to find an enticer pipe as well, so if anyone has one, maybe donate for science ... well so far she is running a lot stronger than with the old head but not like she should be... that is where you guys come in with some help. when i am running her there seems to be no difference between lil less than 3/4 and wot. and when she is wot she doesn't sound revved out. anyone have ideas why?

06-14-2013, 04:56 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: G1 with Enticer 250 Head It should be very difficult for you to find the top rpm with that motor. If it stops revving around 3/4 throttle, the main jet is probably a bit off. Make sure the air jet on the inlet horn is clean.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-14-2013, 05:11 PM	#3
ferdabutt Gone Wild Join Date: Oct 2012 Location: Florida Posts: 206	Re: G1 with Enticer 250 Head now that air jet on the horn is it adjustable like the idle screw or is it a fixed thing? read the mikuni tuning manual but it doesn't say much about the air jet

06-14-2013, 05:18 PM	#4
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: G1 with Enticer 250 Head The air jet is fixed, just like the other jets. It is not normally changed out. The main jet is usually changed. Do you have the Mikuni tuning manual specifically for the VM series?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-15-2013, 12:30 AM	#5
ferdabutt Gone Wild Join Date: Oct 2012 Location: Florida Posts: 206	Re: G1 with Enticer 250 Head this is what my reading material is: http://www.mikuni.com/pdf/vmmanual.pdf

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06-15-2013, 06:24 AM	#7
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: G1 with Enticer 250 Head My pedal is also more vertical than I would like. I was thinking of rigging up some kind of "progressive linkage" to allow a low pedal, but full throttle opening with less movement.

06-15-2013, 09:25 AM	#8
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: G1 with Enticer 250 Head Here's a pic of the linkage I made for my old EZGO. I installed a VM series Mikuni. The pedal didn't have enough throw to fully open the throttle, so I made this that had a ratio of about 1.5:1. It worked very well. The top cable came from the pedal. The bottom cable went to the carb.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-15-2013, 10:41 AM	#10
ferdabutt Gone Wild Join Date: Oct 2012 Location: Florida Posts: 206	Re: G1 with Enticer 250 Head looks like i need to invest in some aluminum....

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