Mukini Vm 18mm Filter + Cable Problem

[Mingola2]

Hi:

I just bought a mukini VM 18mm carb.

Can anybody tell sugest an Air Filter for it.

Also, my throtle cable does not extend long enough beyond the end of the shief in order to fit the new slide body (longer than the original slide). Even with the cable adjusted all the way out, the slide is held in a position of holding the throtle wide open.

Please help with any advise for mods or new parts.

Thank You All!

 

[Creative Engineering]

Mingola,

Welcome to the forum!

A few questions:

1) Have you ever built an engine powered bike based on the in-frame chinese 2-cycle kit? Have you tuned the engine based on the kit carb?

2) What led you to attempt a modification using the Mikuni 18mm carb? I have this same carb here at the shop, and have yet to fit it to an engine...I haven't had time, nor an engine that was modified to the point that it would be useful.

3) Do you have an extensive knowledge of 2-cycle tuning procedures?

In reference to your previous post...yes I can make an intake for this carb...if you're sure you want to use it!

Jim

 

[Mingola2]

Hi Jim:

My answers to your questions:

1)No, I am new to this.

2) I read a posting a few months ago of someone who did mount to his bike and loved it.

3) I don't have experience in tuning a carb.

I guess I might have gotten in over my head!

Regards,

Barry

 

[Creative Engineering]

Hi Jim:

My answers to your questions:

1)No, I am new to this.

2) I read a posting a few months ago of someone who did mount to his bike and loved it.

3) I don't have experience in tuning a carb.

I guess I might have gotten in over my head!

Regards,

Barry

Barry,

I wouldn't worry about getting in over your head! Assembling a bike with an engine requires very few tools.

Your honest response reflects a level headed attitude towards the whole thing...which really is #1 when attempting anything new.

Common sense is key with this project. Start with a stout, good qualty, bike. Most of the department store bikes have adequate frames. Some of them have wheels/tires that are not up to running at a sustained 20-25mph and will need to be upgraded.

Take your time assembling the bike...there is a lot of good info here on the forum, and quite a few who have successfully built several MB's that are here to help.

Now, back to your carb question:

I don't know for sure, but I would bet that the Mikuni is going to be jetted based on an engine that incorporates a reed valve type induction which will produce a lot more vacuum at the inlet. I would expect that, out-of-the-box, the mixture would be too lean. Again I'm just talking off the hip as I haven't even tried mine yet. I am fairly certain that it is going to require re-jetting, and a lengthy test and tune session to get it right.

I would use your kit carb to start with and become very familiar with how this engine works before attempting a major carb swap. The kit carb is very simple, and set-up right out of the box to work well.

Have fun with your build, and feel free to ask for help.

Jim