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Clebba
MMT Member
Joined: Tue May 02, 2017 10:40 am
Posts: 15
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 Mudbuddy 45HD failed leakdown test I did a leakdown test on my 2012 Mudbuddy 45HD and shows a 25% and 30% leakage. the motor has over 300 hrs on it (tiny tach quit on me last season) It sounds like its leaking from everywhere, intake, exhaust, cylinder head and dipstick. so I am assuming the worse case that I need to replace the rings, the head gasket and the valves. I have iron mountain heads on it that were installed when I bought it used. Can I use factory valves or do I need to use the stainless steel valves from BPS? as for rings, can I use factory standard rings or do I need the .020 oversized rings? any other suggestions before I tear it apart and start swapping out parts? anything else I should do while I have it "opened up"?
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2012 1754 GT Hunt Deck Hybrid Rake
2012 Mudbuddy 45 Vanguard HD Mag Sport, Marshmellow exhaust, Mikuni carb
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| Thu Jun 18, 2020 9:49 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Mudbuddy 45HD failed leakdown test Talk to Will C (Texas Mud Motors) or Maxxis (Bayou Surface Drives) on here. I would freshen up the heads, get new one piece valves, etc. Not worth half assing it (doesn't sound like you want to, either). They'll both do you right.
#CFFITR
#mudmotor>physics
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| Thu Jun 18, 2020 10:30 am |
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Clebba
MMT Member
Joined: Tue May 02, 2017 10:40 am
Posts: 15
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Re: Mudbuddy 45HD failed leakdown test Well, I pulled a head and did a leakdown test on the other and could hear air coming from the cylinder on the "headless" one. So, I guess I'm replacing rings.
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2012 1754 GT Hunt Deck Hybrid Rake
2012 Mudbuddy 45 Vanguard HD Mag Sport, Marshmellow exhaust, Mikuni carb
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| Thu Jun 18, 2020 10:05 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Mudbuddy 45HD failed leakdown test And honing the cylinders. May as well do a case gasket delete while it's apart.
#CFFITR
#mudmotor>physics
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| Fri Jun 19, 2020 5:47 am |
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Clebba
MMT Member
Joined: Tue May 02, 2017 10:40 am
Posts: 15
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Re: Mudbuddy 45HD failed leakdown test what is a case gasket delete?
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2012 1754 GT Hunt Deck Hybrid Rake
2012 Mudbuddy 45 Vanguard HD Mag Sport, Marshmellow exhaust, Mikuni carb
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| Fri Jun 19, 2020 9:02 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Mudbuddy 45HD failed leakdown test Before 2015 or 16 i think it was (someone will come along and correct me on the irrelevant timeframe, I'm sure), Briggs used a metal gasket between the case cover and case. After that time frame, they switched to using a gasket sealant like yamabond, kawabond, etc and stopped using the metal gasket on factory engines. It requires slight machining to a couple spots to adjust for the gasket thickness no longer being there. It helps with the inevitable case leak and can be done to older engines.
#CFFITR
#mudmotor>physics
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| Fri Jun 19, 2020 4:17 pm |
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Clebba
MMT Member
Joined: Tue May 02, 2017 10:40 am
Posts: 15
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Re: Mudbuddy 45HD failed leakdown test Well, that aint good.
Guess I'm getting new heads. The other one is fine. What really sucks is that I have to buy a pair and I cant even get a core exchange now.
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2012 1754 GT Hunt Deck Hybrid Rake
2012 Mudbuddy 45 Vanguard HD Mag Sport, Marshmellow exhaust, Mikuni carb
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| Sat Jun 20, 2020 12:55 pm |
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bluesky2012
MMT F.E.
Joined: Mon Jul 14, 2014 8:19 am
Posts: 981
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Re: Mudbuddy 45HD failed leakdown test Don’t buy more iron mountain heads.
Sent from my iPhone using Tapatalk Pro
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| Sat Jun 20, 2020 2:11 pm |
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Clebba
MMT Member
Joined: Tue May 02, 2017 10:40 am
Posts: 15
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Re: Mudbuddy 45HD failed leakdown test Got any suggestions for an alternative to Iron Mountain?
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2012 1754 GT Hunt Deck Hybrid Rake
2012 Mudbuddy 45 Vanguard HD Mag Sport, Marshmellow exhaust, Mikuni carb
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| Sat Jun 20, 2020 2:55 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Mudbuddy 45HD failed leakdown test Bayou surface drives or Texas mud motors.
#CFFITR
#mudmotor>physics
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| Sat Jun 20, 2020 4:12 pm |
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bluesky2012
MMT F.E.
Joined: Mon Jul 14, 2014 8:19 am
Posts: 981
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Re: Mudbuddy 45HD failed leakdown test Yup. That’s Marcus and Will C on here.
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| Sat Jun 20, 2020 7:48 pm |
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Glade
MMT Pro Member
Joined: Fri Apr 18, 2014 7:05 pm
Posts: 150
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Re: Mudbuddy 45HD failed leakdown test
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| Wed Jun 24, 2020 2:30 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Mudbuddy 45HD failed leakdown test I'd be willing to bet that he, like many that have used iron mountain and other worked heads, offered that advice because of the differences in process and experiences using both. His opinion to the OP was to go with another souce of aftermarket. Valve seats crack on Briggs heads regardless of who aftermarketed them.
#CFFITR
#mudmotor>physics
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| Wed Jun 24, 2020 2:41 pm |
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