Back Alive! and throttle hesitation.

[howie2112]

hey all, i posted this in my old thread but i guess it didn't come back to the top. i apologize if it did and i missed it. anyway here was my 'update' post:


hey everyone! i wanted to do an update kinda thing here, as its been so long since i've logged in and posted. anyway, here's my update.

with school out for summer, i finally got around to changing the piston and rings and connecting rod (and oil pan lol) on my 129. long story short, a few days ago it came alive again and i'm thrilled.

BUT. lol. its weird misfire issue thing didn't seem to be remedied by anything i did. (coil, wire, condensor, head gasket, etc) so long story short again, i figured i'd clean the carb and readjust it to what the manual says. the thing is, every plug i've pulled from this have been covered in black soot, so i did just that, and bam, the problem disappeared. now the plugs are brown on the tip. btw, the carb was way off spec, like almost three turns out on each or so. now i'm double thrilled. i can reach full throttle with no problem, no smoke, nothing. smooth as can be. excellent.

but i did run into one more (smaller?) issue, and that is some throttle hesitation when i throttle up, and/or put it into gear. can't seem to figure that one out. i messed around with the carb settings to no avail. any ideas? they'd be greatly appreciated. i'm thinking its a carb issue, as the problem was not there before i re-adjusted the carb.

thanks to everyone here, i've gained much knowledge on here and i'm grateful to have this as a resource. my apologies for a long post.

[howie2112]

i mean heck compared to the weird misfire thing as i like to call it, i'll take this any day. seems like once its warm it isn't as bad, but still does it. it idles kinda weird too. like it isn't getting quite enough gas, or just a tad too much gas. ya know? once you gas it, and get through the hesitation, lol, it really runs like a champ. you know its probably something obvious and right in front of my face. lol. its just got me stumped because it runs fine except when throttle applied.

[Matt G.]

Check the timing, valve lash, and make sure that the governor spring is in the correct holes as shown in the service manual.

[howie2112]

Hey Matt!

i do want to say your posts have been extremely helpful, i always read yours and they're spot on, chock full of info.

ok, i will check that stuff. i'm not sure what a valve lash is, i'm gonna go check the manual and do some googling.

interesting point about the governor spring though, i never gave it much thought. i'll double check that as well.

thanks again!

[howie2112]

come to think of it, i actually have another inquiry, if anyone here has some info to shed some light i'd be grateful.

the service manual for the k301, as many of you may know, does not list prelim settings for the walbro adjustable jet carb. however, the owners manual does list them.

now these settings are way different than the kohler carb, alot less turns (1-1/8 and 1-3/4) as opposed the the kohler.

and when i do the adjustment, i'm obviously turning the screws in before backing them out, (leaner then richer), so if my calculations serve me correctly (which they most certainly might not) the screws are now (at 'proper adjustment') at or under one full turn from bottomed out.

does this seem right? i mean i adjusted them per owners manual spec, but i'd just like to make sure i'm not running it too lean. its just something thats been bugging me, but everything could be fine. i'm no carb adjusting pro by any means, but i figured i'd be fine if i followed the manual, it seemed easy enough. the plug looks 'fine' now, but i'm not sure what i'm looking at when it comes to overheated plugs.

[howie2112]

well now that i double checked the settings in the service manual, although the k301 is unlisted, some others are and they seem to go with what the owners manual said. so i kinda answered my own question. lol

[howie2112]

ok well i hate to make all these posts and i appreciate you reading them, but i wanted to update you all.

i went out and glanced at the governor spring, and its correctly set according to to the manual.

however.... next i checked the oil and there were metal shavings in it. i've been reading alot about running lean (and its been making me very nervous lol) so i said heck i'm backing both screws on the carb out 1/4 turn. so i did that, and even though i shouldn't have ran it with that metal in the oil, i did.

and voila, the hesitation was gone, and the misfire thing has not come back (yet). so it appears i solved both of those issues.

now i can only hope i haven't damaged the piston or rings or rod (all brand new lol) too much. i haven't really used it since i adjusted the carb the first time, so i'm hoping it'll be ok. i'm gonna change the oil and keep an eye on that and the plug. i'll keep you all posted.

thanks to all.

[Cub Cadet 123]

Glad you are up and running. Sometimes the hesitation for the throttle can be as simple as the governor hitting the fuel line.....but that isn't the issue. Obviously you will need to change that oil immediately and you might consider getting a magnetic oil plug to collect those shavings if they are still in there after your oil change.

Cub Cadet 123

[Matt G.]

The metal is from your new rings seating. You need to change the oil quite frequently (1 hour of run time, 5 hours of run time, and probably 5 more later) before going to the interval in the manual.

Too rich is as bad as too lean. The current Kohler manual available for download should have the adjustment instructions for the Walbro carb in it. If not, download the manual for the Magnum singles, and use the adjustment values for the M12. Those Walbro carbs belong in the recycle bin...One of my tractors had an 'adjustable' Walbro carb on it, and no matter where I adjusted the needle, it still ran too rich. Get a #26 carb...

[_DX3_]

Originally Posted by Matt G.

Get a #26 carb...

Matt said it best, get a good carb.