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Discussion Starter #1 (Edited)
I have a new 1332 just traded in a brand new 9-28 (it was way underpowered, trading in a brand new machine cost me $800 bucks) I still felt the 1332 was underpowered so I increased the primary jet by .002 and it woke the machine up. From what I have read California emissions has forced Honda to run the engine on the lean side (engine is lazy under load).

I suspect some of the clogging issues are a result of the engines running so lean.
 

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Discussion Starter #4
I purchased the drill bits (2 bucks a piece) and drilled it myself. It is easy you take out the jet and hand twist the drill bit. There is no need to use power tools your fingers will work fine. Make sure you clean out any brass shavings before reinstalling. I will post the drill bit sizes later today.



The engine had no audible change in the exhaust note when underload now with just a .2 change you can hear a change. I think it can use more and will play with it the next storm. It takes 5 minuets to change it.

I have 22 customers and the machine has to move snow. I also own a 2015 ariens hydro 28 and that machine made the Honda look silly last storm. I run them side by side and the ariens destroyed the Honda I had to figure it out and hope this does it.
 

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...Personally, I'd order a replacement jet and do the .6mm mod on it and test, knowing you have a good (.2mm mod) one in your pocket. You can't go back if it starts to pig out, and then you're stuck. I guess if it were me at the point you are, I'd watch the plug for bit. See if you get some darkening, or just pay attention to smells and sound as you get more snow to test.
Good idea jt.

orangputeh, you can get an OEM stock jet at the usual suspects like boats.net https://tinyurl.com/ya5vcsls ($3.57), PartsPak.com https://tinyurl.com/y72th6se ($4.63), hondapartsnation.com https://tinyurl.com/yb3tdcx3 ($4.43), jackssmallengines.com ($5.27).

I found this supplier for aftermarket jets that has a chart that may be accurate (would jtclays and northeast verify this?) Replacements jets for about $2.95:

https://tinyurl.com/y9xnhvvo

Main Carburetor Jet for Honda, Clone, or Predator Engines - Select Your Size | RLV50** | RLV RLV5008 | BMI Karts and Motorocycle Parts

Carburetor main jet used on the Honda GX160, GX200, Predator 212cc, GX340, GX390, Predator 420cc, and many other clone 6.5 HP 196cc engines.

FYI: Stock jets on GX200s are .028.
FYI: Stock jets on GX390s are .036-.038.
Use a larger opening jet if you're running lean and a smaller one if you're running rich.

Options
SKU Size Number
RLV5010 .032 #81
RLV5011 .034 #86
RLV5008 .035 #88
RLV5012 .036 #91
RLV5009 .037 #93
RLV5013 .038 #96
RLV5014 .039 #99
RLV5015 .040 #101
RLV5016 .041 #104
RLV5017 .042 #107
RLV5018 .043 #109
RLV5019 .044 #112
RLV5020 .045 #114
RLV5021 .046 #117
 

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I appreciate input like this. Going from a GX240 to a GX390, while nice, I can tell there's more to the 390 than what I'm seeing.

I like the idea of hand reaming. Just go easy.

I purchased the drill bits (2 bucks a piece) and drilled it myself. It is easy you take out the jet and hand twist the drill bit. There is no need to use power tools your fingers will work fine. Make sure you clean out any brass shavings before reinstalling. I will post the drill bit sizes later today.

The engine had no audible change in the exhaust note when underload now with just a .2 change you can hear a change. I think it can use more and will play with it the next storm. It takes 5 minuets to change it.

I have 22 customers and the machine has to move snow. I also own a 2015 ariens hydro 28 and that machine made the Honda look silly last storm. I run them side by side and the ariens destroyed the Honda I had to figure it out and hope this does it.
 

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orangputeh, you can get an OEM stock jet at the usual suspects like...
God, quoting myself.

I realize the parts I posted are GX390 snow engine jets...No. 102.
 

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Discussion Starter #8
I spent quite a bit of time researching and talking with small engine builders (go kart racing guys) they assured me the engine should be re jetted. They all said you can go a lot larger with no problem.

The engine just seemed soooooo lazy and running lean would definitely explain this.
 

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:smile_big:
You can go here:

https://affordablegokarts.com/search?page=2&q=Gx390

All kinds of gx390 stuff. Be the first kid on the block to burn the tracks off your Honda!
Thanks for that.

"This is a Honda carburetor tuned for high performance with a richer emulsion tube and 110 main jet. This is the carb we use for the bored/reworked version of the 390 carb. "

Just havin' a little fun with good ol' Photoshop.

...Now get back to re-jettin' :smile_big:

 

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Discussion Starter #17
I opened it up to .041 and it’s a completely different machine. It is exactly what it needs. I said it was lazy now it’s a beast, open it up you will not be disappointed. You will not even recognize it. You guys getting the picture here. Lol

I will run it this way for a bit but may go to .043 worse case scenario is I buy a new jet and go back to .041 but I have a feeling it wants it.
 

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Very cool.

Would .041 be a No 59 bit?

I opened it up to .041 and it’s a completely different machine. It is exactly what it needs. I said it was lazy now it’s a beast, open it up you will not be disappointed. You will not even recognize it. You guys getting the picture here. Lol

I will run it this way for a bit but may go to .043 worse case scenario is I buy a new jet and go back to .041 but I have a feeling it wants it.
 
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