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| RPMs http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=69935 |
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| Author: | boatguy [ Mon Feb 27, 2017 7:45 am ] |
| Post subject: | RPMs |
Don't know if I have a bad BPS Tach on my brand new MB 440 HDR or what. I've asked and googled everything on this motor. It idles high (well I think anyhow) and the WOT RPMs are in the 8Ks ..... I have it set to 1spk to 1, It seems to idle fast,,, 1150-1300 at WOT it is 7000-8300,,, is there something wrong with this thing or way... I have 8hrs on the motor |
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| Author: | Russ [ Mon Feb 27, 2017 7:55 am ] |
| Post subject: | Re: RPMs |
Idle should be somewhere between 1100-1500. Max rpms should be around 4300 or 4750 depending on coils. Should be set on 1 and 2, I think. This aftermarket tach I have is set on that and reports correctly. |
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| Author: | CypressCritter [ Mon Feb 27, 2017 8:38 am ] |
| Post subject: | Re: RPMs |
Must not be a Tiny Tach? Mine is set at 360 which is 1 spark per revolution. Also look at the number of wraps on plug wire, 3-4 is all that is needed, I have 3 and my cable is 12 ft long and works. you should, with a mikuni, be able to adjust idle lower(750 for me in neutral), make sure that your throttle cable is letting the carb come back to a idle position. I made sure that when throttling all the way down there is cable slack at the carb. 8k rpms, is really high on rpms. |
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| Author: | Russ [ Mon Feb 27, 2017 9:16 am ] |
| Post subject: | Re: RPMs |
| Author: | CypressCritter [ Mon Feb 27, 2017 10:27 am ] |
| Post subject: | Re: RPMs |
| Author: | boatguy [ Mon Feb 27, 2017 10:33 am ] |
| Post subject: | Re: RPMs |
Thanks, guys,,, I have 4 turns on now,,, I will take a wrap off and see what that does... Any no it's not a Tiny Tach its the BPS that comes on the 4400... At 10hrs. I will check the valves lash and also change out the break in oil and put my Mobil 1 syn. oil in her.... |
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| Author: | boatguy [ Tue Feb 28, 2017 8:43 pm ] |
| Post subject: | Re: RPMs |
wound up having to take ALL the wraps off with the exception of 1. Now for the first time, I'm reading the REAL RPMs... Thanks guys... |
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| Author: | boatguy [ Sat Mar 04, 2017 3:41 pm ] |
| Post subject: | Re: RPMs |
Well,, I reached the 10hrs on this MB4400 and set the valves at .005 drained the break in oil out, changed the oil filter, put new oil in, and just came back from a test run. She runs smoother then before, and I increased my speed from 29 mph to 31 mph. and my RPMs at WOT was 4110 and now it's 4300,,,, I can't believe it, but she runs even better now.... Thanks again for every bodies advice, greatly appreciate it!!!!!! |
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