TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Boats
Motors
48SPL Stops Making MPH Before It Stops Making RPM
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="tinskin" data-source="post: 457222" data-attributes="member: 24031"><p>I do need a portable tach, any recommendations on one I could easily move from boat to boat? Maybe a tiny tach? </p><p></p><p>I am concerned that I may have moved the power band of this motor by switching carbs and not the exhaust housing as well. OMC introduced this motor as a 100:1 premix, and were jetted for thinner premix, so when I found out I needed carbs I got 50:1 carbs from a later year. Now I see that OMC changed the exhaust housing when they changed carbs. I remember from the motorcross days and later even the street bikes if you change pipes you have to re-jet the carb/s. And on the 2 strokes changing pipes moved the power band. So I guess carbs and exhaust housings are a matched set. Cause even in same hp, same year same everything else, short shaft motors take different jets than long shafts. Is it possible I could have moved the rpm range down a little, maybe from a little more back pressure?</p></blockquote><p></p>
[QUOTE="tinskin, post: 457222, member: 24031"] I do need a portable tach, any recommendations on one I could easily move from boat to boat? Maybe a tiny tach? I am concerned that I may have moved the power band of this motor by switching carbs and not the exhaust housing as well. OMC introduced this motor as a 100:1 premix, and were jetted for thinner premix, so when I found out I needed carbs I got 50:1 carbs from a later year. Now I see that OMC changed the exhaust housing when they changed carbs. I remember from the motorcross days and later even the street bikes if you change pipes you have to re-jet the carb/s. And on the 2 strokes changing pipes moved the power band. So I guess carbs and exhaust housings are a matched set. Cause even in same hp, same year same everything else, short shaft motors take different jets than long shafts. Is it possible I could have moved the rpm range down a little, maybe from a little more back pressure? [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
48SPL Stops Making MPH Before It Stops Making RPM
Top