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 Craftsman GT3000 "MUTT"

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RichieRichOverdrive
DimeWeld
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Join date : 2016-10-29
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeSun May 03, 2020 11:08 am

I mean i probably could've, but you know there's a +$20 premium for anything that's brass. Besides, the hard part is just not breaking off the drill. Besides that it's just a thread, some turning, and cutting a screwdriver slot with a hacksaw.
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Thunderdivine
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeMon May 04, 2020 5:46 pm

Symptom occured when modding the breather? - is the hose smooth on the inside or smooth enough.

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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeMon May 04, 2020 5:53 pm

No it did it with the previous stock air box. The hose is.kind of corrugated, I'm not sure how to describe it. The hose that comes with cheap backyard above ground pools.
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RichieRichOverdrive
DimeWeld
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeTue Jun 30, 2020 11:07 pm

Not dead, yet!

I put a thing on to help stop my foot from sliding off the clutch
Craftsman GT3000 "MUTT" - Page 10 Kimg2012
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MightyRaze
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeWed Jul 01, 2020 2:45 pm

Nice simple mod!

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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeTue Jul 07, 2020 11:54 pm

Rolled mutt in the shop today. I'm tired of fighting to make this engine run well, i think it's just clapped. Low compression, bad valves, weird carb issues. Smokes a lot. Just a pain.
Craftsman GT3000 "MUTT" - Page 10 Kimg2112

Honestly, if i had a good vanny I'd go to it in a heartbeat. But i don't, so my next best option is an oppy with few shared parts- and hopefully few shared problems.

So it's back to the 20hp oppy that was once on her. I have another of the same engine with the governor still on it that I'll take the intake and carb off of, just to be sure. The only thing major that's being swapped over is the other starter onto this one.
Craftsman GT3000 "MUTT" - Page 10 Kimg2113

That's as far as i got tonight, feeling a bit tired.
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RichieRichOverdrive
DimeWeld
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RichieRichOverdrive

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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeWed Jul 08, 2020 10:54 pm

Put the 20hp back together and in, still some stuff to hook up but i got to see if it runs.
Craftsman GT3000 "MUTT" - Page 10 Kimg2114

aaaaaand it does, but won't idle. I imagine it would surge if it were governed. Go figure, this is a 3 screw with fixed jets. I've not been able to get either of those i have to run well either.

For those that don't know, a fixed idle jet on a 3 screw replaces the screw with a screw in sort of jet. A normal needle screws in but I'm not sure if all the internal geometries are the same, though i got this to idle just by replacing it. The carb is probably still dirty so I'll look into that again.
Craftsman GT3000 "MUTT" - Page 10 Kimg2115

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BlakeGroce
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeThu Jul 09, 2020 1:15 am

Oppys are just confusing confused scratch ...nice job on the swap tho!
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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeThu Jul 09, 2020 1:30 am

Carb stuff is only complicated because of Al Gore. Environmentalists are lame when they're only taking political action. Although any ideology is lame if no one is actually willing to step up and get some attention and results. I mean, take a look at Ted K. Rad guy. Only environmentalist worth caring about.
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BlakeGroce
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeThu Jul 09, 2020 3:14 pm

Craftsman GT3000 "MUTT" - Page 10 Combin10
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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Nov 27, 2020 11:53 am

Just bought a 34mm mikuni clone. I'll pick up a pulse pump here soon also. We're gonna see if i can get mutt to run well again.
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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 9:44 am

Finally doing something- machined a carb adapter on the mill.
Craftsman GT3000 "MUTT" - Page 10 Kimg2610
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mh434
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 12:25 pm

I've got a 19.5 hp oppy that's running rough, just like yours. I bought a full carb/pump rebuild kit for it (just arrived last night) & I'm gonna give that a try, but I have to say that Mikuni idea is VERY intriguing! I'll be following this with interest!

My engine is still completely stock, with the governor still hooked up & functioning properly (as far as I know Rolling Eyes ), but I'm wondering - **will the Mikuni's carb connections permit the governor to still be hooked up??**
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RichieRichOverdrive
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 12:42 pm

It won't. Mikunis connect with a cable, no linkages.

I am doing this swap with a horizontal oppy intake- if you don't have one you'll have to do it a little different.
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mh434
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 1:20 pm

Ah, okay.  I hadn't planned on bypassing the governor (and don't have a clue how to do it on this motor) due to exploding flywheel horror stories.  My intake manifold looks exactly like the one in your pic above, with the Mikuni on it.  I could certainly machine an adapter, and I suspect I could locate a good used Mikuni (motorcycle shop nearby that I'm on good terms with).

I'll be interested to see how it works out!

By the way, what size Mikuni is it?  As my engine (and yours, as well, I expect) is a 688 cc engine, I'm thinking maybe a Mikuni off a Kawasaki 650KLR or something might work...although I'd still have to figure out a way around the governor.

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RichieRichOverdrive
DimeWeld
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 2:27 pm

It's not hard to bypass. I've never seen an undamaged flywheel explode.

It's a 34mm mikuni clone. It's a 20hp oppy, so 46ci. Can't remember what cc that is.
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mh434
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 2:35 pm

Cool! I'll look for how to bypass the governor, then! Thanks - I'll be watching for your updates!!
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RichieRichOverdrive
DimeWeld
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RichieRichOverdrive

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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeFri Mar 05, 2021 11:33 pm

So i actually finished the carb adapter tonight, minus cutting a gasket it should bolt right on. Thought I'd go into a little more detail as to how it works.

In this picture you can see i measured the bolt spacing of the intake and just drilled and tapped that into the adapter so i didn't have to find space for nuts. Here you can also see one of the set screw holes that keep the carb in place.
Craftsman GT3000 "MUTT" - Page 10 Kimg2611

I drilled a pilot hole and got my boring head set up and bored the smaller hole to match the inside diameter of the carb, and the larger bore the outside diameter of the carb mounting flange. Make note of the groove in the carb on this picture.
Craftsman GT3000 "MUTT" - Page 10 Kimg2612

In this picture you can see the other side of one of the two set screws. Actually, not the set screw, but the BB i put in there for the set screw to push on, so the end of the set screw doesn't mar up the carb so much. Below that is an O ring that seals on the face of the carb. The set screw holes are placed so that they draw the carb down into this O ring to provide a good seal.
Craftsman GT3000 "MUTT" - Page 10 Kimg2613

It sounds like a lot of engineering, but really this was something i just threw together as I went along.

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mh434
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeSat Mar 06, 2021 1:22 am

NICE JOB!! Lots of thought went into that!
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RichieRichOverdrive
DimeWeld
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RichieRichOverdrive

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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeSun Mar 07, 2021 12:00 am

So i go to mount the carb up with the intake and realize that it's not gonna clear the winch transmission. Great. I found four nuts to space the engine up and really just moved a spacer on the pulley to make it line up again. I might end up turning some spacers on the lathe, or i might just leave these.
Craftsman GT3000 "MUTT" - Page 10 Kimg2615

So now having enough room, i mounted it up and hooked everything up. It ended up a lot lower than i expected, but I'm planning on a snorkel of some sort anyway.
Craftsman GT3000 "MUTT" - Page 10 Kimg2614

I spun her over with a drill as the battery was dead, and before too long she caught prime and fired right up. I have the fuel needle at the richest setting and it runs like an alarmed hominid. Very responsive, and starts easy. I think it's running rich but I'll just have to read what the plugs say after i run it a while.

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TheBeal
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PostSubject: Re: Craftsman GT3000 "MUTT"   Craftsman GT3000 "MUTT" - Page 10 Icon_minitimeSun Mar 07, 2021 8:21 pm

I think some spacers with a bit bigger foot print might be a good idea. I dont think the bottoms of these engines are machined clean across, but around where they bolt down, maybe across some casting webs. Its been a while since Ive looked at one.

Maybe not all that big of a deal though.
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