Thread: Setback Dynafly..
08-29-2007, 03:20 PM #1
Looking for opinions on the setback mod on a dynafly impeller..
My ski an 05 gp1300r with:...
VF3's., 150psi modded stock head., efi controller., modded rideplate (in the works).,
Airbox (either gutted or removed.?)., 800 grate tommy spec ., jetworks mod.,
Next item on the shopping list is a prop.. No Doubt a Dynafly...
So i'm looking for pitch recommendations since i'd like to get it right first time..???
Do i go with say a 14/23 with the setback mod or a 14/24 without or ?????????
This is where i'm getting a bit lost., need help with the choice here guys..
While i'm in about the pump i'll clean it up some., (blueprint it)
Also i've read the setback mod loads the motor up some..??
Anything anyone can think of i might be missing post it up guys..!!!
08-29-2007, 03:28 PM #2
you won't be able to turn anything bigger
08-29-2007, 03:30 PM #3
You don't need anymore than a 14/22 if you are not ported.
I think you should try a stock 14/20 and get a rpm reading
before you pitch it. Then you know for sure that its right.
08-29-2007, 03:40 PM #4
Thanks for the quick replys so far...
This ski will be a long way removed from stock before the dynafly goes into it..
Basically the only mod left will be porting or BB Ported..(which i'm already mulling over)..
From what i've been reading/hearing these mods(mine) will turn a 14/23+ to 7150ish or high 70's mph..??
As i've said i'd like to do this prop one time only,.
Since shipping to/from the UK is a pain in the arse...
08-29-2007, 03:46 PM #5
your going to be hating life if you get too big of a prop
08-29-2007, 03:50 PM #6
gerry as you know i spin my 14/23 @ 7220 in our heat unported,
as the guys said get a stock 14/20 then send it off to one of the good guys in the states once you have rpm reading when we loose your weather..
set back was not for me and I saw no gain...but it dont mean it wont for you..find a prop guy and have a chat once the rpm's are in..
08-29-2007, 03:50 PM #7
08-29-2007, 03:51 PM #8
I didnt see a keyway in the mods list.
Depends on who's pitch, but I say you will be about a 14/21... 14/22 with a keyway.
IMO put the 14/20 in there and see like Ben says.
08-29-2007, 04:29 PM #9
Again thanks for the replys guys...
My problem is i'm a stubborn son of a bitch..
As for the summer heat.. thats a total NON starter for me..
I think and history will prove me right Scotland ain't never been over a 100 degrees ever..
Hell i think England has only ever seen it once and that was last year.. (Paul could confirm this)
So as far heat issues go forget it... my usual riding conditions is "polar bear"
Or say 50 to max 75f...
WFO I intend to do the keyway also(are there known failures from doing this..???)
Getting back to the stubborn issuse i'd rather order a 14/23 then fix it
rather than go 14/20 and FIX it anyway..
08-29-2007, 07:11 PM #10
You need to understand that you can't go back with a dynafly. If you pitch to 14/23, there's no easy way back to 14/22. Better to be a little underpitched and be able to add a bit more. Another thing to remeber is if you're a bit underpropped, you will have a great holeshot and acceleration with pretty good top end. If you're overpropped, it's a dog all the way around.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By ecpChris in forum Yamaha ClassifiedsReplies: 5Last Post: 03-25-2010, 07:22 AM
By WATER WOODY in forum Yamaha ClassifiedsReplies: 5Last Post: 03-28-2009, 08:45 PM
By ecpChris in forum Yamaha PWC Performance (2-stroke)Replies: 28Last Post: 11-22-2007, 12:48 PM
By Chrisrokc in forum Yamaha PWC Performance (2-stroke)Replies: 19Last Post: 04-18-2007, 09:11 AM
By NateGP1300R in forum Yamaha PWC Performance (2-stroke)Replies: 3Last Post: 07-08-2006, 05:32 PM