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breakuplandreneau
MMT Pro Member
Joined: Sat Mar 20, 2010 11:20 am
Posts: 143
Location: O' piece a' loose azz
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 High rpms So I went run my boat the other day and while running down stream in a pretty strong current my motor was turning 4500rpm's, I had no issues with my valves floating or my engine not running correctly, just a little concerned if I should be turning that many rpm's.
Mods include HSR 42mm mikuni carb, roller rockers and billet pushrods, and bps twins, my rev box is supposed to be for 4350rpm's but apparently it's not cutting the ignition at what it's set for.
Main concern is if I should be turning that many rpm's with a stock valve train ?
Does anybody have any pics on what stock valves look like when they are shimmed ?
_________________
Brother Breaux 18x54 and a 36 Prodrive with all the goods
1851 excel with a 35 mudbuddy.......sold
17x42 geaux skiff with a 27 prodrive........sold (should've kept this one)
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| Tue Feb 07, 2012 8:24 pm |
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duckduckboom
MMT Elite Member
Joined: Tue Nov 23, 2010 6:33 pm
Posts: 5603
Location: Corner of Hell an high water, La
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Re: High rpms what does your prop look like
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You have your whole life to be an idiot, take a day off!
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| Tue Feb 07, 2012 8:25 pm |
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craig
MMT Elite Member
Joined: Tue Jan 13, 2009 7:53 pm
Posts: 7515
Location: Chauvin
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Re: High rpms Ever had any head work done? If so...who?
If your heads are stock...your valves are floating at those rpm's.
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1750 GatorTail Extreme/Stage 3 37 GTR HD
Procrastination is a lot like masturbation. Sure it sounds great at the time but, in the end your only f--k--g yourself.
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| Tue Feb 07, 2012 8:28 pm |
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breakuplandreneau
MMT Pro Member
Joined: Sat Mar 20, 2010 11:20 am
Posts: 143
Location: O' piece a' loose azz
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Re: High rpms Prop is in good shape, no issues with the performance of the motor, as far as I know the heads are stock unless the valves are shimmed, my main question is if anybody knows what stock shimmed valves look like and if they have any pictures.
_________________
Brother Breaux 18x54 and a 36 Prodrive with all the goods
1851 excel with a 35 mudbuddy.......sold
17x42 geaux skiff with a 27 prodrive........sold (should've kept this one)
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| Tue Feb 07, 2012 8:32 pm |
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craig
MMT Elite Member
Joined: Tue Jan 13, 2009 7:53 pm
Posts: 7515
Location: Chauvin
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Re: High rpms Did you buy the engine used?
_________________
1750 GatorTail Extreme/Stage 3 37 GTR HD
Procrastination is a lot like masturbation. Sure it sounds great at the time but, in the end your only f--k--g yourself.
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| Tue Feb 07, 2012 8:38 pm |
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deadbird8
MMT 1000 Club
Joined: Wed Feb 04, 2009 7:50 pm
Posts: 3833
Location: Old East Dallas, Texas
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Re: High rpms
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Excel 1851F4 w/ MB35HD+R CDI with a little bit of this and little bit of that
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| Tue Feb 07, 2012 8:47 pm |
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breakuplandreneau
MMT Pro Member
Joined: Sat Mar 20, 2010 11:20 am
Posts: 143
Location: O' piece a' loose azz
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Re: High rpms Thanks deadbird8 this is what I needed to know, FYI I'm not running dual carbs, it's the single mikuni (BPS setup) that I have
_________________
Brother Breaux 18x54 and a 36 Prodrive with all the goods
1851 excel with a 35 mudbuddy.......sold
17x42 geaux skiff with a 27 prodrive........sold (should've kept this one)
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| Tue Feb 07, 2012 8:53 pm |
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deadbird8
MMT 1000 Club
Joined: Wed Feb 04, 2009 7:50 pm
Posts: 3833
Location: Old East Dallas, Texas
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Re: High rpms
_________________
Excel 1851F4 w/ MB35HD+R CDI with a little bit of this and little bit of that
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| Tue Feb 07, 2012 8:56 pm |
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breakuplandreneau
MMT Pro Member
Joined: Sat Mar 20, 2010 11:20 am
Posts: 143
Location: O' piece a' loose azz
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Re: High rpms Just pulled the valve cover and clear as day the valves are shimmed with the same shims as in the picture, i could clearly read "this side up", so I guess the 4500 rpm's that i hit earlier wasn't a problem, keep in mind that was running in a very fast current, when i was running in a slow to non-existent current that i was turning around 4300-4400 rpm's.
_________________
Brother Breaux 18x54 and a 36 Prodrive with all the goods
1851 excel with a 35 mudbuddy.......sold
17x42 geaux skiff with a 27 prodrive........sold (should've kept this one)
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| Tue Feb 07, 2012 9:47 pm |
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garrettpearce
MMT 1000 Club
Joined: Mon Jul 27, 2009 8:10 pm
Posts: 1436
Location: down da bayou
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Re: High rpms I'm having the same problem just installed new heads by calen blackdeath intake and mikuni and I'm turning 4700 plus I'm not sure why I'm turning up so much. Brand new prop
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| Tue Feb 07, 2012 9:57 pm |
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breakuplandreneau
MMT Pro Member
Joined: Sat Mar 20, 2010 11:20 am
Posts: 143
Location: O' piece a' loose azz
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Re: High rpms Maybe its the awesome ethanol that we're having to run in our motors! LOL, Just joking I hate that shiat!
_________________
Brother Breaux 18x54 and a 36 Prodrive with all the goods
1851 excel with a 35 mudbuddy.......sold
17x42 geaux skiff with a 27 prodrive........sold (should've kept this one)
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| Tue Feb 07, 2012 10:03 pm |
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Beadlejuicejr
MMT 1000 Club
Joined: Tue Nov 02, 2010 7:11 pm
Posts: 1435
Location: Bayou vista, Louisiana
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Re: High rpms
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stage 3 GTR screaming behind the 1848 Garrett Pearce special. GET YOU SOME!
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| Tue Feb 07, 2012 10:10 pm |
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garrettpearce
MMT 1000 Club
Joined: Mon Jul 27, 2009 8:10 pm
Posts: 1436
Location: down da bayou
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Re: High rpms No not really but more bottom end
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| Wed Feb 08, 2012 9:38 am |
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