Honda gxv390

All non-Cub/Cadet/IH/Farmall/Case tractor and machinery discussions.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Honda gxv390

Postby john2189 » Tue Dec 29, 2020 2:28 pm

13 hp pull start motor. I can pull this with the choke on til I’m blue in the face, no start. Give it a shot of starting fluid, it fires right up, take the choke off and it runs great. I’m sure it’s a dirty carb, but does it hurt anything to use starter fluid?
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

User avatar
Urbish
5+ Years
5+ Years
Posts: 2250
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Honda gxv390

Postby Urbish » Tue Dec 29, 2020 2:54 pm

I would guess that your choke isn't closing all the way if it is running good once it gets going. Do you have the ability to partially disassemble the air intake side enough so that you can seal your hand over the intake of the carb to choke it and see if that works? You could inspect the operation of the choke at that time too.

I've used starting fluid only in limited occasions. If you have to use if every time, it's worth digging deeper to solve the underlying problem. That said, there probably isn't any concern with using starting fluid. As an alternative, you can put some gas in a small spray bottle (of a variety that won't decompose from the gas) and use that instead. It's much cheaper! As always, beware using either starting fluid or a spray of gas as any residual bit that doesn't make it in the carb can ignite if the engine backfires or if you have a stray spark.
Jim

Circle of Safety

User avatar
Urbish
5+ Years
5+ Years
Posts: 2250
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Honda gxv390

Postby Urbish » Tue Dec 29, 2020 3:00 pm

I found some information at this link: https://www.outdoorking.com/forum/ubbthreads.php?ubb=showflat&Number=36768

Reading down through it, some people replace the choke spring with a weaker one to resolve this problem. You'll want to pull your air cleaner off to look at the choke operation and see if this is causing your problem.
Jim

Circle of Safety

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 23598
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Honda gxv390

Postby John *.?-!.* cub owner » Tue Dec 29, 2020 3:10 pm

Don't overlook the possibility of the carburetor bolts being loose, that will give the same symptoms
If you are not part of the solution,
you are part of the problem!!!

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Tue Dec 29, 2020 3:41 pm

Jim, I read the link you sent and the choke does close and seems to be working. It doesn’t want to idle, so could the idle circuit be plugged?

John, the carb bolts are tight
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

User avatar
Urbish
5+ Years
5+ Years
Posts: 2250
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Honda gxv390

Postby Urbish » Tue Dec 29, 2020 5:16 pm

Ahh, if it won't idle, then you need to clean or rebuild the carburetor.

I have in a few instances 'cleaned' a carburetor without taking anything apart. I drain the fuel bowl, then fill the fuel bowl (through the fuel line) with carburetor cleaner. Full choke and crank it over to the point of flooding. Walk away for an hour, then reattach fuel line and try to start it.
Jim

Circle of Safety

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Tue Dec 29, 2020 5:41 pm

Yes that might work if it’s gummed up.

Would the idle stop it from starting?
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

User avatar
Urbish
5+ Years
5+ Years
Posts: 2250
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Honda gxv390

Postby Urbish » Tue Dec 29, 2020 5:55 pm

john2189 wrote:Would the idle stop it from starting?


It depends on the carburetor design, but generally no. The idle fuel circuit is separate from the high speed fuel circuit. I'm not familiar with that engine or the particular carburetor design. Maybe somebody more knowledgeable will chime in.
Jim

Circle of Safety

User avatar
Don McCombs
Team Cub Mentor
Team Cub Mentor
Posts: 15415
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Honda gxv390

Postby Don McCombs » Tue Dec 29, 2020 6:04 pm

I’m not familiar with that carburetor, either. But, you can do some degree of cleaning, while the engine is running, with Deep Creep. It’s basically Seafoam in a spray can. Follow the label instructions.
Don McCombs
MD, Deep Creek Lake

Image
Proud Member of Maryland Chapter 39
Circle of Safety

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Tue Dec 29, 2020 6:58 pm

Ok thanks
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

User avatar
MiCarl
501 Club
501 Club
Posts: 532
Joined: Sat Dec 16, 2017 8:28 am
Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Honda gxv390

Postby MiCarl » Tue Dec 29, 2020 8:47 pm

I have also seen this with engines that have very low compression. You don't get enough air drawn through the carburetor to lift fuel from the carburetor when cranking (or pulling). Once you get it spinning fast on the ether it draws enough to get fuel.
1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Tue Dec 29, 2020 9:31 pm

Seems to have good compression, it is rope start
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

staninlowerAL
10+ Years
10+ Years
Posts: 4085
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1 is parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (3)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Honda gxv390

Postby staninlowerAL » Wed Dec 30, 2020 6:43 am

You could check the valve clearance. I had a B&S engine once that the valve clearance was next to nothing and would not let the valves seat. Adjusted the clearance and solved the starting problem.

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Wed Dec 30, 2020 8:37 am

I will check the valves. Easy to do
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower

john2189
10+ Years
10+ Years
Posts: 1532
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390

Postby john2189 » Sun Jan 03, 2021 6:59 am

Checked the valves. They were good
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar
Honda 48” walk behind mower


  • Similar Topics
    Replies
    Views
    Last post

Return to “Other Tractors and Machinery”

Who is online

Users browsing this forum: No registered users and 2 guests