Rev.Mike 1 #1 Posted February 14, 2016 im having a problem with my kohler, it starts and runs fine, but sometimes it will run smooth then bog down like under a load, then smooth out, ive checked for vacume leaks and checked the points gap and cleaned the carb, dont find anything wrong, any idea guys Share this post Link to post Share on other sites
Rob R 933 #2 Posted February 14, 2016 Hmmm could be a lot of things but my guess it is probably friction related.... specifically drive train related like a bad bearing in a idler pulley, the drive belt rubbing or something binding.... reminds me of when you start a cold engine with the clutch in and the engine bogs if you let off before it gets a moment to warm-up.... suggest you chk everything in the drive chain for binds also oil and gear movement in the transmission (friction - binding) .....just saying.... Share this post Link to post Share on other sites
Rev.Mike 1 #3 Posted February 14, 2016 it does this when it idles or high rev, the drive belt is off of it at the moment, had to get a new one cause the old one was in bad shape Share this post Link to post Share on other sites
woodchuckfarmer 333 #4 Posted February 14, 2016 Have you checked your fuel system Like the vent in the tank or water in the gas.? 1 Share this post Link to post Share on other sites
Rev.Mike 1 #5 Posted February 14, 2016 i have not checked that, ill leave the cap off drain the tank, and lines and put in new gas and see what happens Share this post Link to post Share on other sites
Shynon 7,427 #6 Posted February 14, 2016 Throttle shaft play, run the motor and wiggle the throttle shaft and see if that changes the way it runs. 1 Share this post Link to post Share on other sites
Phatboy 565 #7 Posted February 14, 2016 1 hour ago, woodchuckfarmer said: Have you checked your fuel system Like the vent in the tank or water in the gas.? I would look into fuel also , does it have a filter on there ? If so id change it and check fuel line for cracks maybe sucking air in with fuel Share this post Link to post Share on other sites
Rev.Mike 1 #8 Posted February 14, 2016 i did put on a new filter, and checked the connections, and ran new fuel lines, i will check valve clearances, and do a little tweaking on the carb tomorrow, and see what happens Share this post Link to post Share on other sites
KC9KAS 4,741 #9 Posted February 14, 2016 @Rev.Mike 1 Share this post Link to post Share on other sites
russellmc301 600 #10 Posted February 15, 2016 check the spark plug i know it sounds dumb but i have had some original plugs that are just nubs and that whats happen. Share this post Link to post Share on other sites
Ed Kennell 35,143 #11 Posted February 15, 2016 Was the float OK when you cleaned the carb. Set to correct height, no leaks, new valve seat. Share this post Link to post Share on other sites
Rev.Mike 1 #12 Posted February 17, 2016 (edited) float was fine in it, set right, i got it to run better, reset the valve lash, they were too wide, re set the points, it idles just fine, but speeding it up, it will hesitate, then go, BUT when you put it under load, it will run fine for a few minutes, then start to spit and sputter, i converted it to a new pulse pump, new filter, so im still at a loss, adjusted the carb every way i can, and it will run good, then after a while, it will act up, changed the condenser, same thing, even new coil, coil wire as well Edited February 17, 2016 by Rev.Mike Share this post Link to post Share on other sites
Ed Kennell 35,143 #13 Posted February 18, 2016 Sounds like it could be sucking air. Check the bolts and gasket between the carb and block. Did you check for play in the throttle shaft like Shynon suggested? 1 Share this post Link to post Share on other sites
WNYPCRepair 1,875 #14 Posted February 18, 2016 5 minutes ago, ekennell said: Sounds like it could be sucking air. Check the bolts and gasket between the carb and block. Did you check for play in the throttle shaft like Shynon suggested? Spray some carb cleaner around the intake, etc, see if it changes 3 Share this post Link to post Share on other sites
Callen 64 #15 Posted February 18, 2016 Where did you add the pulse for the fuel pump? Share this post Link to post Share on other sites
Rev.Mike 1 #16 Posted February 19, 2016 i did check the throtle shaft play, and there doesnt seem to be any, sprayed around it and no change, same with around the gasket, no change, as far as where i got the pulse for the new pump, i made a plate that fit over the old fuel pump location, and drilled and tapped it so it would take a nipple for the vaccume line, and ran it to the pump, the pump works fine, i think i may just need to get a new carb, this one may just be wore out, 1 Share this post Link to post Share on other sites
WH nut 553 #17 Posted February 19, 2016 When it bogs down, look at the throttle linkage to see if its going full throttle, if if is, add a little choke and see if she speeds up. If it does and runs better you are running lean and need to adjust the carb Share this post Link to post Share on other sites
ericj 1,576 #18 Posted February 19, 2016 i had a mag 12 that use to do something like that, but only when hot, it turns out that it was a valve sticking had the valve guides redone and it helped and the tractor runs good now eric j 1 Share this post Link to post Share on other sites