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Author Topic:   Welcome to Johnny Talk!
BugsyG posted 10-08-2003 07:35 PM ET (US)   Profile for BugsyG   Send Email to BugsyG  
Hi fellow Whaler'ers!

I found the plate on my Johnny stating the range of which to run her at.

70 hp. 1984 Johnson -- Rebuilt 2 years ago

It simply stated that it should be ran from 4500-5500.RPM's

BIA at 5000RPM's (What the heck does that mean?/!)

And something else like PIS or something with a "P" in it at 5000 RPM's


I run her from 3800-4000 RPM's @ 25-28 MPH. WOT is 4800 @ 34 (Clean bottom) Is that right? Could someone please shead some light on the subject of what the plate means? Thanks a lot for participating in Johnny Talk!

~JAZZ~

Bigshot posted 10-09-2003 11:01 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
4500-5500 is WOT(wide open throttle) range. In other words you should be between 4500 & 5500 when she is mashed to the console and obviously the linkage is allowing you full throttle. What size prop are you running Jazz? 4800 is on the low side. I would drop down 2" of pitch and get her up into the 5200 area. You should be running a 17" prop.

BIA is Boating Institue of America I believe and they rate your engine at 70hp @ 5000 rpms.

hooter posted 10-09-2003 01:08 PM ET (US)     Profile for hooter    
Ah'll talk in the john if propriety demands sociability, but usually Ah prefers t' keep mum and CONcentrate.

Nothin' woise than a gott-damm, slap-happy gabber runnin' on in the crapper:-!

BugsyG posted 10-09-2003 06:16 PM ET (US)     Profile for BugsyG  Send Email to BugsyG     
Bigshot,

I am running a 13.25 X 17" Pitch. Aluminum Job. I thought about stainless but its $$$$$$. My prop is about 2 years old. No nicks or dings in it. Just the paint is coming off of it.

Hoots, you crack me up!!!!!


JAZZ

Bigshot posted 10-10-2003 11:27 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
She is either mounted too low, tired or waterlogged hull. You should be doing better than that and up in the 37+mph area.
ryanwhaler posted 10-10-2003 08:48 PM ET (US)     Profile for ryanwhaler  Send Email to ryanwhaler     
JAZZ had the motor rebuilt two years ago. So I don't think the motor is tired.

Jazz,
Have you ever took your boat to a truck stop to, check the the weaght?

Bigshot posted 10-13-2003 10:40 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Rebuilt is in the eye of the rebuilder.

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