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Improving Your Mokai

Shop Talk => Mokai Original 2001-2009 => Topic started by: Darrin on October 04, 2019, 01:44:48 PM

Title: Honda GC190 High Idle
Post by: Darrin on October 04, 2019, 01:44:48 PM
Thought I would post an update on the bargain Honda motor I got on Ebay.  In my excitement to swap everything onto my shiny new little motor I didn't notice that the carb on the new motor lacks an idle screw, My motor idles too fast and no way to tune it down. GRRRR.
Title: Re: Honda GC190 High Idle
Post by: Painlesstom on October 04, 2019, 03:55:15 PM
Use your old carb, would be easiest fix anyhow. Is the carb lever bottomed out at the lowest idle point and it's still too high? Or is the governor arm holding it there because something else isn't letting it come down?
Title: Re: Honda GC190 High Idle
Post by: Darrin on October 04, 2019, 04:18:56 PM
 I can pull the throttle closed a little more but there is no more cable adjustment to help. I was told that carb was for a constant rpm application like a pressure washer. I can put the old carb on and maybe it will work better on the new motor. Funny thing about all of this is, I was having trouble getting the old motor and carb to run right and thought I would cure all of my problems with a whole new motor. HaHa. On a side note... is it just me or does everybody hate taking the carbs of and on these Honda motors?!
Title: Re: Honda GC190 High Idle
Post by: Painlesstom on October 04, 2019, 04:32:17 PM
Yeah, the Honda's were never easy to work on or tune. Why many of us went to the Subaru. Night and Day difference. Easy electric starting, smooth idle, charging system, quieter, faster. Just no comparison.

The spring that connects the cable lever to the governor arm can be lengthened with a zip tie, that could give the slack you need for the idle to come down.
Title: Re: Honda GC190 High Idle
Post by: Darrin on October 04, 2019, 04:44:19 PM
Thanks,  will give that a try. would love to override that governor also, need a little more rpms
Title: Re: Honda GC190 High Idle
Post by: Painlesstom on October 04, 2019, 04:53:00 PM
The governor is a highly misunderstood system. Unless that spring that the cable lever is pulling the governor arm with is too weak to pull the throttle open wide while under a load, then there is nothing to gain by removing the governor. It's just acting like a return spring when the engine is running, the higher the revs the more force it applies. That is calibrated by the spring tension previously mentioned to keep the engine from over revving. Something that won't happen on the water, only out of water. It allows the throttle to be opened by the little spring on the carb lever linkage when the rpm's drop, that is why the engine hunts at idle sometimes. The whole design was for running on industrial equipment that needed a constant rpm under load. It's a pain when trying to "drive" it in a boat or vehicle. You can put a zip tie on the cable linkage lever and hook the spring to that, that makes the spring "longer" so the carb can goto idle better, then you can put a zip tie through the spring coil to keep it from stretching; that will keep the governor from being able to limit rpm and will basically override it.
Title: Re: Honda GC190 High Idle
Post by: Darrin on October 05, 2019, 08:10:48 AM
I will give both little tricks a try next week when I'm off, Thanks! Been whacking the Coho in it, and duck season is about to start so trying to get the new toy trustworthy. The Columbia river at 4am in December is not where you want to breakdown...