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post #31 of 56 Old 10-03-2012, 09:05 PM Thread Starter
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Re: The Mikuni to $14 Honda Carb Swap

GTP, glad you enjoyed the thread, hope your Zuki's can use the help!

I bought the carb from, of all places, ' boats.net ,' I had never used them before, but they had all the parts I needed and were the cheapest. I'm not sure I'd use them again, the carb took ~7 days to even ship but it did arrive just fine, and I'd rather support my local shop.

Video to follow!

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post #32 of 56 Old 10-05-2012, 06:30 PM Thread Starter
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Re: The Mikuni to $14 Honda Carb Swap

Alright, took a short video of the Mikuni & 'Honda' Carb. Not a real fair comparison since one of the mowers had BBC. Mowed a bit with both today and then the Mikuni/BBC wouldn't restart for me when hot...May have the $150 coil failure coming. The Honda ran very good, although I still think I have it set up too rich, lots of burbling and a hint of smoke (Mikuni doesn't do that.) I leaned out the idle jet more on the very adjustable idle screw, but I think the main may simply be too drilled out.

Should be available shortly at :

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post #33 of 56 Old 10-05-2012, 07:20 PM
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Re: The Mikuni to $14 Honda Carb Swap

Just FYI if you want to remove the idle mixture cap all you have to do is heat it up with a propane torch and melt the loctite and pull the gray cap off. Obviously this should be done without any gas in or around the carb LOL. Great thread BTW
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post #34 of 56 Old 10-08-2012, 10:28 AM
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Re: The Mikuni to $14 Honda Carb Swap

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...the Mikuni/BBC wouldn't restart for me when hot...May have the $150 coil failure coming...
Great sticky on the Honda carb retrofit, and it sounds like one more may be in order for the Nova II transitorized module retrofit for the hot restart/coil failure issue (not to volunteer your services, but you did such a top notch job on this one - maybe a fall/winter project ) These two issues should cover 90% of any problems folks have with these wonderful engines.
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post #35 of 56 Old 11-01-2012, 10:43 PM
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Re: The Mikuni to $14 Honda Carb Swap

Just did this to my Toro 20684. Thank-you!!!! In the words of Peter Boyle, "Holy Crap!" I spent all summer messing with jets for the mikuni. First, I spent $90 on a used mikuni to replace my original one with a leaky needle seat and that just got a carb broken in a different way. Then, I spent $13 on manifold gaskets thinking I had a leak. Then I got another set of $13 gaskets because I tore the first ones up taking the carb on and off. Then, spent $50 on pilot and main jets.
2 weeks ago started to read this thread so I spent $16.50 on the carb and roughly $2 on a gasket. Had the carb on in 30 min. and the mower that I hated is now a pleasure.
By the way, I melted the stop of the pilot mix screw and set it 1/2 turn out and DID NOT change the main jet. The mower runs great and the plug is beige. So, the jet seems correct.
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post #36 of 56 Old 11-02-2012, 06:54 AM Thread Starter
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Re: The Mikuni to $14 Honda Carb Swap

Joe,
Awesome to hear this was 'the fix' for your 20684! That may be my favorite mower, so it's great to hear another one is running well!

I will probably repeat the swap on my second Suzuki this winter, so that's great info about the jets. I won't complain about buying a $6 main jet to replace the one I drilled either after all the money you spent.

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post #37 of 56 Old 08-22-2013, 01:40 AM
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Re: The Mikuni to $14 Honda Carb Swap

Had to replace the governor arm, so while I was at it I noticed that I was getting a bit of contact with the shaft between the governor and the butterfly, and the top of the heat shield plate. You might want to add a step that removes a little material off the top off the heat shield as well.
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post #38 of 56 Old 09-04-2013, 09:19 PM
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Re: The Mikuni to $14 Honda Carb Swap

OK. So, I've been toying with this some more and I feel that the carb for the 190cc honda may be a bit much. The plug is tan, so the mix looks good, but the mower wants to run at HIGH rpms. I had to do a governor adjust that left 1/8 inch gap until the wide open stop. That way the motor ran at a reasonable speed.
I think I'd try to put on a keihin for a 160cc or 120cc even. Well next time...
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post #39 of 56 Old 09-04-2013, 09:54 PM Thread Starter
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Re: The Mikuni to $14 Honda Carb Swap

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OK. So, I've been toying with this some more and I feel that the carb for the 190cc honda may be a bit much. The plug is tan, so the mix looks good, but the mower wants to run at HIGH rpms. I had to do a governor adjust that left 1/8 inch gap until the wide open stop. That way the motor ran at a reasonable speed.
I think I'd try to put on a keihin for a 160cc or 120cc even. Well next time...
Hmm, if it's running fast something else is wrong....I'd say the carb is lean on the Zuki 2 stroke if anything.

You have an air leak (carb cleaner test?)? Idle screw way out?

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post #40 of 56 Old 09-05-2013, 12:19 AM
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Re: The Mikuni to $14 Honda Carb Swap

No air leak. I'll check the idle screw again tomorrow. I know I turned it out to enrich it thinking it was running fast because it was lean.
Did you have contact between the top of the heat guard plate and the shaft from the butterfly to the governor? I did.
I just split the cases and looked at the governor. It looked good.
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post #41 of 56 Old 09-05-2013, 07:06 AM Thread Starter
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Re: The Mikuni to $14 Honda Carb Swap

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Did you have contact between the top of the heat guard plate and the shaft from the butterfly to the governor? I did.
No, don't believe I did. My governor rod is bench pretty well though from removals and replacement. Believe someone else mentioned this problem in the thread.

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post #42 of 56 Old 09-05-2013, 11:10 AM
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Re: The Mikuni to $14 Honda Carb Swap

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I think I'd try to put on a keihin for a 160cc or 120cc even. Well next time...
You're talking about the ones for the GXV engines right? I don't think they'll work because the mounting holes aren't the usual horizontal pattern - one's higher than the other. But if someone could invent an adapter plate to accept the Keihin, we could ditch all those fussy Mikuni's!
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post #43 of 56 Old 12-21-2013, 01:21 AM
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Re: The Mikuni to $14 Honda Carb Swap

Can anyone confirm this works on the lawnboy M-Series? My CM21ZMR is in need of a carb.
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post #44 of 56 Old 03-22-2015, 08:48 PM
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Re: The Mikuni to $14 Honda Carb Swap

I hate to wake up a two year old thread, but I finally put the Honda carb on my Suzuki. It started on the third pull (using starter fluid), but I have extremely high revs. Which hole did you use on the throttle plate, inner or outer hole? I used the inner which was maybe my mistake. I also probably didn't put the governor plates (dogs on the crankshaft (flyweights)) back correctly but before I split the engine apart (again) I just wanted to know which hole I should use on the throttle plate (inner hole or outer hole) from the governor arm.

TIA,

Mark

Actually to serve Lee Marvin better, the name should be "Kid Shelleen", my bad.

Last edited by KidSheleen; 03-22-2015 at 09:12 PM.
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post #45 of 56 Old 03-22-2015, 09:46 PM
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Re: The Mikuni to $14 Honda Carb Swap

2 years is too long for me to retain a visual. Wish I could help more, but I will say this: I tried this modification for 2 years and I never did get it right. The original thread comes from a 4-cycle suzuki. If I had it to do over again, I'd throw down the dough for a new original Mikuni carb and be done with it.
Mine was behaving just as you describe.
I even split the cases and looked at the governor to make sure it was working properly.
Perhaps someone had better luck than I. Good-luck to you.
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