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| 22 HP Predator on JBMM SD Need prop and gearing help http://mudmotortalk.com/mmt_v2/viewtopic.php?f=41&t=71846 |
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| Author: | StorminNorman85711 [ Fri Jan 05, 2018 11:03 am ] |
| Post subject: | 22 HP Predator on JBMM SD Need prop and gearing help |
I am new to surface drives, and recently bought a used JB Mud Motor with a 15 HP Lifan, 9 x 7 prop, and roughly a 1:1 ratio (odd?). The top sprocket is a 32 tooth and I believe the bottom is a 31. It was pushing my 1548 about 14 MPH with just me, and 8-10 MPH with a hunting load and a buddy. It bogged the 15 HP pretty bad, and I had some issues with the motor, so I replaced it with a stock Predator 22HP. The 9x7 cavitates with the new 22 HP so I have ordered a new 11x10 as suggested by Hill Marine. I haven't been able to get the boat up on plane and get any speed out of it, so that is the goal. My question is this: Will I likely need to gear down from the 1:1 in order to run this new prop in the proper RPM range with the new 22hp? If so, any suggestions on a ratio to start with? Thanks in advance for any advice. |
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| Author: | brycecheramie [ Sat Jan 06, 2018 2:45 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
Seems like a big prop for that motor, but you can start with a 1.5:1 gear ratio is what I would do. Then go from there. If you don't have a tach, you better get one! That will help you figure if gearing needs to be changed |
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| Author: | Johnny-O [ Sat Jan 06, 2018 5:53 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
11x10 is the correct size for the motor, but I'm not sure about the gearing. Sent from my SM-N950U using Tapatalk |
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| Author: | DENNYEDWARDS [ Sat Jan 06, 2018 6:24 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
Old MB Hyper 18 HP came with a 32 top and 50 tooth lower and it could turn a 11x10 MB prop. That gearing ought to be pretty close for your application. |
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| Author: | StorminNorman85711 [ Mon Jan 08, 2018 1:30 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
Thanks guys. So I got the new prop installed, and the motor will pull it just fine. I can run about 20 MPH. I don't have a fixed tach to see what I am turning while running down the river, but with checking it with my auto multi meter, It turns 3800 rpm on the trailer with no load. I have a tach ordered. So here's my new question..... Does anyone know how to sucessfullly remove/bypass/cheat the governor on a new 22 hp Predator? I was able to achieve 4000 rpm (no load) by putting a stiffer spring on the throttle linkage. That gave me another 4 MPH BUT.....the boat would only run 100 yards and then bog and shut off. Idled rough too. moved the spring back and it runs fine at 20 mph. Any ideas? |
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| Author: | StorminNorman85711 [ Mon Jan 08, 2018 1:30 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
Thanks guys. So I got the new prop installed, and the motor will pull it just fine. I can run about 20 MPH. I don't have a fixed tach to see what I am turning while running down the river, but with checking it with my auto multi meter, It turns 3800 rpm on the trailer with no load. I have a tach ordered. So here's my new question..... Does anyone know how to successfully remove/bypass/cheat the governor on a new 22 hp Predator? I was able to achieve 4000 rpm (no load) by putting a stiffer spring on the throttle linkage. That gave me another 4 MPH BUT.....the boat would only run 100 yards and then bog and shut off. Idled rough too. I put the original spring back and it runs fine at 20 mph. I am not trying to abuse the motor and push it too hard, but I thought I would turn it up just a bit as the current 3800 rpm seems a bit low, and from the sound of it, I believe she could handle a tad more. Any ideas? |
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| Author: | Darryle [ Mon Jan 08, 2018 6:04 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
| Author: | 50fps [ Sat Jan 13, 2018 3:42 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
I ordered my 04 hyper 23hp with a 36/52 pulley set and was able to spin a 12x12 from Hopkins with no problem. It had headwork, cam, rockers and a few other go fast items tho. |
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| Author: | oneball [ Thu Apr 26, 2018 9:25 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
The issue is with the fuel pump you will have to go to low pressure electric and your motor will pull fine at 4000rpms. I had same issues with mine google pred fuel issues and you will find a few of the same problems others have had. Sent from my iPhone using Tapatalk |
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| Author: | oneball [ Thu Apr 26, 2018 9:26 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
| Author: | oneball [ Thu Apr 26, 2018 9:30 pm ] |
| Post subject: | Re: 22 HP Predator on JBMM SD Need prop and gearing help |
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