Sport 40 pipe length

[Tim Kish]

Thanks Tim, you're right .380 is the I.D. of the stinger. I shimmed it down with some brass tube. I'll try your suggestion for the strut, it should help settle it down a little.

It will help settle it down with a side benefit of picking up a little more speed B)

Tim K

 

[Norm Doerr]

Just what Rick said.. Carb too big... especially with a sport boat.

Start with the carb. smaller.. is better.

 

[FloridaScaleBoater]

Just what Rick said.. Carb too big... especially with a sport boat.

Start with the carb. smaller.. is better.

Thanks for the back up there Norm!!!

 

[Kerry Norton]

I'm running a Whiplash with an HR 45 (stock except I replaced the .471 bore carb for .390), AB pipe at 9 3/8, 45%, X450 detongued with a Barr cut, very fast with good throttle. Could not get that big carb to work.

 

[FloridaScaleBoater]

I'm running a Whiplash with an HR 45 (stock except I replaced the .471 bore carb for .390), AB pipe at 9 3/8, 45%, X450 detongued with a Barr cut, very fast with good throttle. Could not get that big carb to work.

Kerry

Did you put an RS carb on it, to get down to the .390? Or did you do it another way?

 

[Bill Gibson]

Thanks so much guys for the GREAT input....Al Hobbs is lookin thru his stuff to see if he has a carb that might work a little better...GREAT guy! I hope when i can get the green stuff together i can get an AA45 when my Mac blows...he did say the carb for the AA45 is smaller for better throttle control....Dont want to sound like im knocking Macs as they sure aint lackin for power, i just wish the power was more controlable...they are DEFINETLY well built!

 

[Kerry Norton]

GeorgiaScale....been experimenting with making my own carbs, found information on ram tube designs in a book on carburation. Both carbs are .390 bore, the extended stack worked best in my sport 40.The author claims this design of the outer rim enhances flow efficiency 5% on a 4 stroke engine by cleaning up air flow into the venturi. I had one of those AA45's in my hands just recently, nice piece, .390 bore carb. Like the way the carb's position rotates on the back plate. I'll try to attach pics.