How many hours is too many on a motor - Page 2

lumberslinger178 · #11 06-09-2009, 07:59 PM

Quote:

Originally Posted by phatdaddy

side note: we were chainsaw dealers from 69 to 86 and then the average life of a homeowner chainsaw was 4 to 6 hours.

Ha ha I believe that.... sounds like me and lawnmowers

lumberslinger178 · #12 06-09-2009, 08:09 PM

talk about propping heres my motor after about 25 hrs of running the wrong prop.... I repeatedly told the A- hole who sold me the motor that I didnt think it was propped properly ( say that 3 times fast) and he kept saying thats the prop brp recomends...... needless to say he was wrong .....blown powerhead on a brand new motor.....

thank god for the warranty.... zero out of pocket expence , only two weeks lose of time ......

cterrebonne · #13 06-10-2009, 08:08 AM

lumber what was your max rpm's?

lumberslinger178 · #14 06-10-2009, 08:35 AM

Quote:

Originally Posted by cterrebonne

lumber what was your max rpm's?

5600 to 5800

and was only running at the time 4700.

cterrebonne · #15 06-10-2009, 10:12 AM

Quote:

Originally Posted by lumberslinger178

5600 to 5800

and was only running at the time 4700.

you were only turning 4700 wot? wow, you bought that engine from a dealer?

lumberslinger178 · #16 06-10-2009, 03:45 PM

Quote:

Originally Posted by cterrebonne

you were only turning 4700 wot? wow, you bought that engine from a dealer?

yes I did , hes was so busy i became just a number to him, once he got my money he was done with me.....

cterrebonne · #17 06-10-2009, 04:39 PM

Quote:

Originally Posted by lumberslinger178

yes I did , hes was so busy i became just a number to him, once he got my money he was done with me.....

man that sucks bad, sorry to hear. they have a dealer about 1.5 hrs away that does that same thing. I dont think they have a real rigging dept.

Hammerhead · #18 06-14-2009, 03:38 PM

I was told,...and believed'm that my '77 I/O had around 3000 hours on it. It ran fine and was only replaced due to a screw getting sucked down the carb and landing on a piston which blew a hole in the head. Otherwise it'd have about 4000 hours by now.

re;OBs,...I had a 20 year ld "115 "rude that ran strong till it caught fire and burned up,...while still running all the way across biscayne bay.

Steplift 72' · #19 06-14-2009, 08:38 PM

Quote:

Originally Posted by Blue_Runner

Step, don't you mean under-propping? If not, what is it about over-propping? I've heard underpropping causes the motor to work harder, which makes perfect sense to me but I don't think I've heard of over-propping??

By overpropping, I mean too much pitch. Back in the late 70's I had a dealer sell me a 115 with a 19" prop. It managed to make just over 5000 rpm at WOT with a light load. The recommended range was 5000 to 5500 rpm. Loaded it ran 5000 rpm and accelerated slowly. By 250 hours it barely made 4900 rpm and had lost a few pounds of cranking compression on #1 cylinder. Later, a local dealer told me that he'd rather see an outboard slightly over the maximum end of the rpm range. His point of view was that he'd repaired many more motors being lugged than over revved.

My 1986 248 Offshore was propped to turn 6000 rpm with a full load and I sold it running well with over 2000 hours.

cterrebonne · #20 06-14-2009, 11:56 PM

motors being damaged from lugging is even more important now than ever with the newer four strokes on the market.