Grey market B7000 surges really bad on start up

[TreeFeller86]

I just picked up a grey B7000 thats been sitting in a field uncovered for the past oh... maybe 5 years. Got it home did oil changes. took apart the injectors and cleaned them up. fresh battery and hit the key after a little glow. It spit and fired up after about 5 minuets but as soon as it fired it went FULL throttle and died. after a few rounds of this i could keep it running by feathering the throttle up and down. I found the sweet spot to keep it running but the engine surged to full throttle and back to "idle" and it continues to do this for almost 20 minuets. After that time it settles down and runs perfect. throttle works correct and smooth. Any ideas what the issue is because its got me baffled. I assume the injector pump but i hear they are the last thing to go bad. Help!

Kristian

 

[Kubota Newbie]

Broken or disconnected governor spring or assembly. (probably the spring)

 

[TreeFeller86]

Great! Ill take a look at that. I was also told by the kubota shop here in town that it could be the diaphragm/lifter units that physically pump the fuel feeding too much fuel or leaking fuel into the oil and causing it. He also said he has herd that worn lifter guides could be letting oil into the combustion chamber and causing the issue...both of those suggestions seem a little far fetched to me... they sure did want to sell me a new rig tho!

 

[birddogger]

Maybe you just needed to "blow the cobwebs out?" Is it still doing it? Old fuel and oil dry up and get sticky, perhaps with fresh fuel and oil getting through things it will loosen up and stabilize?

 

[TreeFeller86]

Its been doing it the 4 times i ran it. it seems to get a little better every time. I have fresh fuel, fuel lines and filter. I have not yet changed the engine oil because i havent found the filter for it but now i know the engine model so it should be a snap.

 

[kuboman]

Sounds like the governor is sticky. Not surprising. Clean fresh oil and run it long and hard for a while will loosen it up.

 

[TreeFeller86]

Come Saturday that's exactly what I planned on doing after an oil change! I like your style!

 

[TreeFeller86]

Thanks for the all the help guys. After that oil change and running it for a few hours now she starts up first try and idles just like she should. no more revving or surging.

 

[kuboman]

Thanks for the all the help guys. After that oil change and running it for a few hours now she starts up first try and idles just like she should. no more revving or surging.

Great to hear. Always nice when it is simple