Possible prop problem

[sunbird]

Just bought a new prop for my 1990 Johnson 120 (spun the old one). Now every time I get the engine to 5400 rpms it feels like the prop is spun again. If I lower the rpm's a little it runs fine. It is also ok on hard accelerations. Do you think the prop is bad or is there a rpm limit on the engine causing it to cut out?<br /><br />Also, wrote in about a quickstart problem last week. Advice was to change/check the thermostats and diaphragm. Good advice, changed everything and no more problems.<br /><br />thanks again.

 

[Dhadley]

Re: Possible prop problem

You didnt mention what prop you had before or which one you have now. If you had an SST before and now have an aluminum or a Ballistic, your venting could be explained. <br /><br />Your rev limiter is at either 6200 or 6700 and causes the motor to not rev past that rather than lose bite as you described. <br /><br />More info please!

 

[sunbird]

Re: Possible prop problem

Sorry, I replaced the original aluminum OMC prop with the same aluminum one from OMC.<br /><br />I will pull the prop off this week and see if there are any of the typical signs of a spun prop. If none, I will then make some marks on it and check after running it.<br /><br />Could it be some other engine problem possibly?<br /><br />Any ideas are appreciated.

 

[Spidybot]

Re: Possible prop problem

It would help greatly to know how your speed & rpm behaves during this?