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| RPMs http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=73991 |
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| Author: | forresj [ Mon Jul 15, 2019 7:16 am ] |
| Post subject: | RPMs |
Finally got a tach for my 35 HP GDSD with a mikuni and dual exhaust. Running it this weekend on the river I would get to about 1/2 - 2/3 throttle and about 3900-3950 RPM and then it would start cutting back. It also feels like when I get the RPMs up that high the prop is slipping. If I remember right, the prop is about 11" across, but I'm not sure what Godevil's props measure when they are new. I'm getting maybe 20 mph in a 1644 with 3 guys and a 50 lb pup (about the same as what I get with just me and one other guy). Any help? I don't want to start buying stuff before I know what the problem may be. |
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| Author: | brycecheramie [ Mon Jul 15, 2019 7:37 am ] |
| Post subject: | Re: RPMs |
Sounds like your carb may not be tuned correctly if you start losing rpm's when full throttle. But it also sounds like you are maxing out the load in the boat and the motor. 3 guys is a 16x44 is just about pushing it. Even though you have a carb and exhaust, you have no headwork to help. |
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| Author: | Will C [ Mon Jul 15, 2019 7:59 am ] |
| Post subject: | Re: RPMs |
Agreed. Mikuni with stock heads is a lot of carb |
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| Author: | cb5331 [ Mon Jul 15, 2019 10:13 am ] |
| Post subject: | Re: RPMs |
Slide could be over-travelling. Sent from my SM-T710 using Tapatalk |
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| Author: | MaXXis85 [ Mon Jul 15, 2019 10:20 am ] |
| Post subject: | Re: RPMs |
4300 CDI coils? worn prop? |
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| Author: | forresj [ Mon Jul 15, 2019 11:41 am ] |
| Post subject: | Re: RPMs |
I have no idea on coils from what I understand everything is stock outside of exhaust and carb. Prop is worn I thought that might have something to do with it. |
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| Author: | Wchauvin [ Mon Jul 15, 2019 3:02 pm ] |
| Post subject: | Re: RPMs |
Could very well be a worn prop like marcus said |
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| Author: | kirk [ Mon Jul 15, 2019 6:58 pm ] |
| Post subject: | Re: RPMs |
I think your rpms are fine. I Believe your maxed out with that load and size boat. I could be wrong, but with a stock 35 GD in water you’re always gonna be around 3750-3900. GD props new are 11” across. I’ve got heads cam exhaust and with the load your describing I’m running 3800-4100. Anymore and I lose speed. I also have a burnt prop that measures 10 1/4- 10 1/2. I have a 17x44 alweld and I imagine your boat is heavier than mine. Unless yours is an old one it could be .100 gauge Sent from my iPad using Tapatalk |
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