Heymow - Lawnmower Racing Forum

Engine Help => Kohler Engines => Topic started by: cerialsledder on July 07, 2013, 05:56:21 pm

Title: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 05:56:21 pm
Hey guys I'm running a Kohler cv490s in my racer right now but I can't seem to get it to clear up on the top end. I noticed the lmk carb doesn't have a high speed adjustment.... Any idead or advice would be appreciated. I have a billet flywheel on it currently if that helps.... I was thinking of maybe making a plug for the bottom of the bowl and limiting the amount of fuel at WOT...

Thank you
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 06:30:32 pm
Dose it spit and spudder at top end or getting to top end?
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 06:39:13 pm
Just seems like it is too rich on the top on, like it's not quite getting there like a spit and sputter.... I know at the last race I messed up and put 110 gas in it and iif you don't have the compression it won't burn it (accidentally grabbed the wrong can) but before that running pump gas I still couldn't get the top end to clear out and having someone spank me with a 13 hp briggs is frustrating
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 07:55:17 pm
I forgot to mention that it seems to hesitate when you hit the throttle.  If I ease into it or the rpm's are already up there it seems to be fine but dropping the hammer when the green drops is a bit of a challenge.  I usually drop back a position at the start because of the hesitation.
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:16:34 pm
Its ok most of fxs at our club beat the fxt. Ya your probly getting to much fuel my keihin was doing that at one time and I had to get smaller main jet.
when my carb was running rich it would speed up and stop at 1500 rpm and fall flat on its face. Is that what yours dose.
Ya if u don't have high compression I wouldn't run race fuel. just run premium. For my new motor since I milled it I cant run unleaded fuel anymore.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:25:25 pm
yeah it falls on it's face.... if I go to a smaller jet though doesn't that bring my hp down though? wonder if I could just make a plug on the bottom, drill and tap it to take a needle and help restrict the fuel running on the top end?  Or do I find another carb with a high speed adjustment?
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:30:48 pm
Question are u running a fuel pump. No getting small jet wont ruine hp. It probly make it run better.
Il try to find a new carb with adjustment you cant find one try it that way. But for where I live kohler carbs are hard to come by and are expensive so ill try to find one before you start trying things.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:30:53 pm
no fuel pump, it's gravity fed
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:32:54 pm
Good, ya I would try to find one you can adjust because your running rich. Like my carb did the same.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:33:40 pm
any ideas what carb I should be looking for? it's 17 hp
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:36:49 pm
lol idk I never ran kohler I was about to got different motor instead. Hmm is this for stock motor then I would take it to local small engine repaire shop and see if they have one like take carb off and see. If its for like fxs  then ill just get something like motorcycle carb.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:38:39 pm
I have a briggs v twin intek sitting in the corner but it's too big to run in our classes since we allow 20 hp singles and 18 hp twins..... wonder if that carb would fit
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:41:58 pm
That 17 is single idk how that dual carb would work lol. LIke I said just go to local small engine repaire show and see. 20hp singles so your saying some run kohler 20hp flatheads lol.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:43:22 pm
no most of them are running briggs ohv singles.... There is one guy running a 17 kawasaki
Title: Re: kohler top end won't clear out
Post by: The Tank on July 07, 2013, 08:45:16 pm
Where you from Soodude?
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:45:51 pm
Those have good torque for stock motor. Kohler is very good to pluse they make parts for kohler. Kawaski there aren't many parts specialy for 17hp.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:46:03 pm
I'm from Sault Ste Marie, MI
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:47:09 pm
What MI state is that lol.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:48:44 pm
Those have good torque for stock motor. Kohler is very good to pluse they make parts for kohler. Kawaski there aren't many parts specialy for 17hp.

He's the guy to beat right now and his kawasaki is stock with the stock steel flywheel as well.... he wrapped the flywheel cover with the wrap that they use on professional pulling tractors in case it desides to grenade on him to help protect him from injury
What MI state is that lol.

Upper peninsula.... A Yooper
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:52:46 pm
Ya reason why is because govern stock kawasiki has mower torque then any other singles. Idk if you wwant to win by billet flywheel or buy same motor as him.
Oh upper Michigan I live in the southern part. Ya that kawaski is fast govern but kohler built would beat kawaski,
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:54:30 pm
Ya reason why is because govern stock kawasiki has mower torque then any other singles. Idk if you wwant to win by billet flywheel or buy same motor as him.
Oh upper Michigan I live in the southern part. Ya that kawaski is fast govern but kohler built would beat kawaski,

I have a billet flywheel right now it's just getting the top end to clear up is my problem
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 08:57:44 pm
U should spank that dude with that flywheel. Um ya your running rich try to find a carb at local small engine repaire shop or on ebay with adjustable jet.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 08:58:42 pm
No repair shops around here and not familiar enough with kohler carbs to know what I'm looking for on fleabay.... need assistance LOL
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 09:06:18 pm
let me check one sec ill look for you.
go to ebay type in Kohler CV490 it will show guine carbs and stuff.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 09:10:08 pm
Ok I'll check right now

checked it out but it doesn't say if the high speed is adjustable, just says genuine on them....
Title: Re: kohler top end won't clear out
Post by: Burwell555 on July 07, 2013, 09:11:34 pm
Check your private messages
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 09:22:08 pm
messaged ya back Burwell
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 09:50:10 pm
Im not really sure on where to find carb I was just pointing you to direction to look burwell would be the best to ask he had kohler. I just was telling you that your running rich.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 09:53:25 pm
yeah I'm searching for a lmt 56 right now.....
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 10:10:04 pm
There was at one point a kohler racing and pulling carb for kohler ohv. Idk if it sold or not it was under race mower.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 07, 2013, 10:20:03 pm
hmmm, I'll dig around and see what I can find but I'm gonna try burwell's idea about soldering the main jet and redrilling
Title: Re: kohler top end won't clear out
Post by: Darkviper on July 07, 2013, 10:23:21 pm
you can do that.
Title: Re: kohler top end won't clear out
Post by: Johnson Mowersports on July 07, 2013, 11:39:01 pm
Didn't I read somewhere that the coils on the kohlers break up a little over stock rpm put u a Briggs coil on it
Title: Re: kohler top end won't clear out
Post by: Burwell555 on July 07, 2013, 11:54:10 pm
The right Kohler coil has been proven to take 11,000 rpm by MWSC, however the smart spark coils are junk
Title: Re: kohler top end won't clear out
Post by: Johnson Mowersports on July 08, 2013, 02:27:14 pm
The right Kohler coil has been proven to take 11,000 rpm by MWSC, however the smart spark coils are junk
yeah but which coil does he have
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 08, 2013, 03:35:53 pm
I got Kohler coils on it  :)
Title: Re: kohler top end won't clear out
Post by: Burwell555 on July 08, 2013, 06:27:07 pm
With a super cub flywheel??
Title: Re: kohler top end won't clear out
Post by: flatlanderfornow on July 08, 2013, 06:30:14 pm
I've soldered main jets before, it works fine.
May be some other options-
#26,28 or 30 kohler carb.  Or a KT 17 carb. All are fully adjustable, but I don't know if they
would work for you or not, maybe someone here does.
If that carb has a removable main jet you may be able to use a high altitude
jet, should be a little leaner and you could drill it out some if you had to.
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 08, 2013, 08:41:57 pm
With a super cub flywheel??

No my :censored: phone autofilled what I was trying to say.... I have the stock coil on it and the flywheel is arc... I wanted a flywheel with the cooling fins on it and arc had them and super cub were all flat... Sorry about that Burwell
Title: Re: kohler top end won't clear out
Post by: Burwell555 on July 08, 2013, 09:25:55 pm
So if you have an arc flywheel with a Kohler coil, I'd venture to say that's your issue. Look into reading the info in the link below

http://www.heymow.com/index.php?topic=25214.15
That may have something to do with it? I was under the impression to had a MWSC wheel and Kohler coil
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 08, 2013, 10:32:33 pm
Hey I found my invoice from last year.... I have a Midwest Super Cub billet aluminm basic kit... came with the flywheel and cooling fins so that clears that up.... 275 for the kit...hmmm thought I paid more but I have a carter 30 carb coming so I will see what happens when it gets here and I'll keep yas posted..... You know it's been a long few days when you can't even remember what you bought for parts on your motor..... Oye I need sleep LOL
Title: Re: kohler top end won't clear out
Post by: cerialsledder on July 09, 2013, 09:01:57 pm
well kind of cleared up my top end today... I took and tapped a bowl plug and threaded a needle into the bottom of it so it could restrict fuel flow to lean it out a touch and it worked great.  Plug is burning like it should but I'm still going to put that carter 30 on it and run it.  Can't quite get rid of the low end hesitation but hopefully that carter will help me out.... Thanks for all the input guys