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i didnt realize there was a outboard specific forum. checkout my post on the general forum about performance with os max outboards. I need all the advice i can get !
Thanks~ James
Thanks~ James
os max outboard hop ups
- Thread starter topfuel443
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TomMoorehouse
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james.... i got to love that quote under your avatar! at 31 i'm right in between 
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Tom,
My Dad actually told me that this weekend after he bought a pretty expensive toy, and he's 55. you still got a ways to go.
p.s. The new site is really coming together well!
~ James
My Dad actually told me that this weekend after he bought a pretty expensive toy, and he's 55. you still got a ways to go.
p.s. The new site is really coming together well!
~ James
James,
My suggestions for the OS would be;
1. Head clearance - set it to 8 thou.
2.temperature. Is the motor hot after a full run with the needle set right? you should try holding the head straight after a run - it should be hot - if it's cold or warm it's not burning the fuel properly. restrict the water accordingly.
3. Tuned pipe - the OS's respond very well to a tuned pipe as the standard muffler is very restrictive for power.
The lower unit is very good - why change it?
Hope this gives you some ideas.
My suggestions for the OS would be;
1. Head clearance - set it to 8 thou.
2.temperature. Is the motor hot after a full run with the needle set right? you should try holding the head straight after a run - it should be hot - if it's cold or warm it's not burning the fuel properly. restrict the water accordingly.
3. Tuned pipe - the OS's respond very well to a tuned pipe as the standard muffler is very restrictive for power.
The lower unit is very good - why change it?
Hope this gives you some ideas.
MikeP
Well-Known Member
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- Mar 13, 2002
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- 1,460
James,
Sharpen the skeg! they are pretty fat. a prather 215 and octura x440 work good, a prather 220 back cut a little to get the rpm's up works really well with a tune pipe. I use the silver bullit pipe, info on it is in another post called "A new outboard pipe?" I have also seen the irwin pipe run and it is just as good. As Tim said make sure it runs hot enough.
-MikeP
Sharpen the skeg! they are pretty fat. a prather 215 and octura x440 work good, a prather 220 back cut a little to get the rpm's up works really well with a tune pipe. I use the silver bullit pipe, info on it is in another post called "A new outboard pipe?" I have also seen the irwin pipe run and it is just as good. As Tim said make sure it runs hot enough.
-MikeP
- Joined
- Oct 23, 2002
- Messages
- 6,451
Hi all,
Thanks Mike and Jim, I am running a 437/3 octura right now with an irwins pipe. Ive modified the carburetor inlet taper a bit to allow a more direct flow. ive also sharpened and polished the lower unit. someone told me to take the stock headshim out and run it with nothing, The clearance right now without a shim is about 5 thou. and it seems to like the 50% redmax im running. as for the temp, im still working on that. i plugged the stock outlet hole on the head and drill a hole directly in the top of the head about a third of the diameter. its definately running hotter but i think it could be a little warmer. any recomendation on what temp to run at? Ive also played with the transfers a little but not much. thanks for the reply.
~ James
Thanks Mike and Jim, I am running a 437/3 octura right now with an irwins pipe. Ive modified the carburetor inlet taper a bit to allow a more direct flow. ive also sharpened and polished the lower unit. someone told me to take the stock headshim out and run it with nothing, The clearance right now without a shim is about 5 thou. and it seems to like the 50% redmax im running. as for the temp, im still working on that. i plugged the stock outlet hole on the head and drill a hole directly in the top of the head about a third of the diameter. its definately running hotter but i think it could be a little warmer. any recomendation on what temp to run at? Ive also played with the transfers a little but not much. thanks for the reply.
~ James
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