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View Full Version : Sure flow buzzing / chattering


chevegan
06/18/2008, 10:26 AM
I just installed the sure flow kits on 2 mj-12s. And they are buzzing/chattering constantly. They weren't doing it in the beginning, but after about 8 hours it's all they do now. Anyone else having this issue?

I read the low reviews on marinedepot and they all complained about the same thing. Yet there are sooo many good reviews that I thought that they might just be flukes.

mattyg
06/18/2008, 10:55 AM
Same for me on mj900. Maybe ours are defective. I've seen some at LFS that are smooth and silent.

luke33
06/18/2008, 10:59 AM
On the mj1200, you must use the high flow impeller's as the low flow s will humm. If they are stopping sporadically, you need to clean the pump. When i can hear mine i know its time for a cleaning.

joshkennedy07
06/18/2008, 11:02 AM
I had a similar experience. I bought one as a test run. It ran well for about a week maybe 2 and gradually started getting noisy. Eventually the bushing (nearest to motor) started slipping causing some noise. The bushing then broke loose and made all sorts of noise. My MJ was used and think this may have been the cause. At any rate my mod kit now lives in my garage in a box.

chevegan
06/18/2008, 01:53 PM
I used the high flow impeller and it seemed to have quieted down for now. In fact with the high flow just one pump pushes some massive amounts of water through the entire tank

luke33
06/18/2008, 02:37 PM
Same experience as you Chev

stanlalee
06/18/2008, 04:20 PM
I can 3rd that. with the maxi-jet 1200 you must use the 2100. Its quiet with the 2100 prop but buzzes and annoys with the 1600 prop. I put the 1600 prop on a maxi-jet 400 and all is quiet (and damn powerful too!). If you want to use the 1600 prop use a maxi-jet 400-900.

chevegan
06/18/2008, 04:45 PM
my god I put the 2100 prop on the second PH and the tank is going crazy lol like a hurricane. It's sucking in water down 6".

HOWEVER the second pump will not STOP trying to go backwards

Jefe12234
06/18/2008, 07:07 PM
I have two Sure-Flows on MJ-1200's. One of them made a buzzing sound with the small impeller and the other sometimes tries to run backwards with the large impeller. They may run better on smaller MJ's, but with the 1200's at least these mods seem to be very hit or miss.