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 MTD off-road build (Mobile Terrain Dominator) "2"

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RichieRichOverdrive
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Sun Dec 30, 2018 10:01 pm

Pulse line in good condition?
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AllisKidD21
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Sun Dec 30, 2018 10:03 pm

Yeah, I actually just had it off today to get to the PCV assembly. No holes in the line or anything.

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RichieRichOverdrive
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Sun Dec 30, 2018 10:12 pm

Flywheel key ok?
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AllisKidD21
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Sun Dec 30, 2018 10:17 pm

Yeah, I checked that a couple of times a while ago and it was still good.

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
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Crazy_Carl
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Mon Dec 31, 2018 5:18 am

Does is fire right up with starting fluid? that could help narrow it down to either a fuel or spark problem. maybe you have some rare problem with the magnet on your fly wheel? Maybe low compression?
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AllisKidD21
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Mon Dec 31, 2018 10:35 am

No I've tried ether in the carb while cranking and that doesn't help it, but when I check for spark it's there. Maybe it's not strong enough under compression though...

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
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MightyRaze
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Mon Dec 31, 2018 7:55 pm

Sounds like MTD and Red has the same issues as I have mentioned in the past.  It is worse when cold.  Also like you experienced, changing plugs will make it run again fine sometimes for a little while.  

On mine I have checked everything like you.  It's almost like a gremlin in the system.

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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:08 pm

if it wont run on starting fluid, you have a spark problem, back before the wheel horses, we messed with all kinds of tractors, and any oppy we had always seemed to have spark problems sooner or later. and most all of them loved to foul spark plugs. had 3 or 4 that would loose spark after the coil got warm, but only if you shut it off, say it was cold, it would start right up and run all day. unless you shut it off, then no matter how much you cranked or worked on it, it wouldnt start. until you let it cool clear back off then start right up. How are you setting the gap on your mag? and are you getting a big fat white spark or a little blue or purple spark? is the spark going to same part of the spark plug or dancing around to a differnt part of the spark plug each time? If it was mine Id put a new, not "good" used, coil on it. and a brand new set of plugs
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:16 pm

Just FYI Ive been fooled by weak spark many many times, and replaced expensive parts, cleaned carbs etc everything but spark plugs and coils and only figured it out the hard way. on more than one occasion. had a quad that would rattle the choke a tiny bit closed and foul the plug without me knowing. left me stranded and I went home from a big riding trip because I couldnt figure it out, because I checked and it had spark. well guess what got home and after bunch of other diagnostic work still wouldnt run. was gonna scrap the quad but just for the hell of it put a fresh plug in it and it fired right up. also had me and a couple buddys gx390 foul a plug every couple of years just randomly, same thing, good spark but wont run. new plug fixes it. also I dont think brand really matters but I only run NGK and have had very good luck with them
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RichieRichOverdrive
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:17 pm

I forgot i had a coil like that. Would start cold and run as long as you want, but if you shut if off and tried to start it while it was still hot you couldn't spin it fast enough with the starter for it to make spark. That engine doesn't have that issue anymore though, as I've replaced the coil.
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AllisKidD21
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:43 pm

Oh a had a brand new coil on 'er, that didn't fix the issue and new plugs didn't either. Unfortunately. Also mine never had the hot starting issue. When I could get it running, I could drive it around for a half hour or so, shut it off, and it would start right back up again if I hit the key. But let it sit for maybe 15 minutes and forget about it. No starting at all.

Like Might said, definitely a gremlin in the system. So I decided to remove said gremlin today:



Yepper, time to move on. For a while anyways. I can mess with the pressure lube model 40 whenever I feel like it now, but without having a dead tractor.

Got my 18hp model 42 out to prepare it to go in the tractor.



Got some stuff put on it. Put the original carb back on it, and used the brand new coil that was on the pressure lube engine.



Everything hooked up, filled with oil, and grille back on.



First start!



Had an issue with the throttle not working properly, but I got that fixed and it works perfectly now.



Did some wheeling... She runs good! Had to tweak the carb mixture a bit to get the throttle response better, but it's a good running unit now.

So yeah...kind of a bummer that the pressure lube opposed is out, but it ain't the end of the world. Or the engine, haha. I'll get to it again someday, for now I'm just glad to have the MTD back!

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
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MightyRaze
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:46 pm

Not sure if @AllisKidD21 is having the same issue... but what about cold hard start until it gets warm then it restarts easier?

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RichieRichOverdrive
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:53 pm

I would've tried swapping the intake from the splash onto the pressure lube myself (probably ruining both engines in the process). Nice you got it running though!
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:57 pm

I've wondered if it were a compression issue on mine.  I need to check it cold then again warm on mine. Possibly a valve adjustment.

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Last edited by MightyRaze on Wed Jan 02, 2019 10:58 pm; edited 1 time in total
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AllisKidD21
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:57 pm

Yeah I'm sure there's a few different things I could've tried, but I just got so tired of tearing it apart and changing things with no success that I couldn't find the motivation to work on the bigger any longer. I can still mess with it to get it running though! I just don't have it in the MTD anymore.

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
        - Craftsman GT 6000 Off-Road/Workhorse Build
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MightyRaze
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 10:59 pm

@AllisKidD21 wrote:
Yeah I'm sure there's a few different things I could've tried, but I just got so tired of tearing it apart and changing thing with no success that I couldn't find the motivation to work on the bugger at all. I can still mess with it to get it running though! I just don't have it in the MTD anymore.

I understand man... Especially since you have a spare engine ready to go. I need to work on getting the 2 others I have running.

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RichieRichOverdrive
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Wed Jan 02, 2019 11:00 pm

Nice. I'm thinking about throwing my pressure lube back together for a while to see what it acts like myself.

So Allis, any upgrades planned for this thing anytime soon?

And did you ever get the rims painted? lol!
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 11:48 am

Here's an idea, might not be the case here, but what if something screwy is going on with your kill switch.  The switch might only be meant for 12vdc, but if you're using it as a kill switch it has to break a much higher AC voltage.  Maybe the high voltage is jumping across the switch contacts giving you a gremlin spark problem?  This idea doesn't make a ton of sense for you because once your engine is warm you don't have this problem.
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 11:57 am

I tried it with the kill wire unplugged from the coil a couple times.

Anyways I've been driving 'er around a bunch this morning:



Running great! Sure is nice to be able to hop on and drive 'er whenever I want. You can see the exhaust collector I made for it as well. Sounds pretty cool and keeps the flames down, haha.

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 5:17 pm

Glad to see it back in action
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 6:06 pm

Thanks CC. I sure am too, haha.

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
        - Craftsman GT 6000 Off-Road/Workhorse Build
        -John Deere 110 Basic Project
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Crazy_Carl
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 8:58 pm

Nice action shot
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Thu Jan 03, 2019 11:28 pm

Thanks Carl. With every romp, ya gotta take at least one picture. lol!

_______________________________________________
"This is where the thinking came in.... that took a while."- Red Green                "Memory is good, remember that" - Tomas Haake
                                                                        ----Uploading Pictures----
        - M.T.D. Off-Road Build
       
- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
        - Craftsman GT 6000 Off-Road/Workhorse Build
        -John Deere 110 Basic Project
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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Fri Jan 04, 2019 7:24 am

@AllisKidD21 wrote:
Thanks Carl. With every romp, ya gotta take at least one picture. lol!

That's a good thing to keep in mind!

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PostSubject: Re: MTD off-road build (Mobile Terrain Dominator) "2"   Fri Jan 04, 2019 7:26 am

Bonus points for pictures with the tractor topside bottomwise lol!
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