Thread: Carb Swap Question
09-21-2009, 05:05 PM #1
Carb Swap Question
Is it possible to put 787 carbs on a 717? I've got a bad 787 and I was thinking about putting the carbs on my `96 HX. Will they bolt right on or does it take modification? What kind of performance increase could I expect?
09-22-2009, 06:57 AM #2
it would take some rejetting, if the bodys actually bolt up
if you are not competent at that you could melt a motor down.
Not sure how much difference you would find,, it would be a gain here but lose a little there kind of thing
09-22-2009, 07:30 AM #3
I think the 787 used 40s where the 717 were 38s. As dghal (btw, we are all going to hell for looking/staring at your avatar pic) pointed out, the jetting will need to be adjusted.
If you consider that 38s can turn a stock 717 about as fast as it can be turned you would not see much, if any real gains.
The carbs are slightly larger so you could get slightly more air and slightly more fuel (once jetted properly) but without some way to process that air and fuel (ported cases, cylinders, a pipe, pump tuning) it is just not going to do much.
You are more likely to end up lean, and, well, that story has been played out time and again, has it not?
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By MSXMAN in forum Yamaha Open DiscussionReplies: 2Last Post: 11-09-2007, 12:04 PM
By Jolly Roger in forum Yamaha How To & FAQsReplies: 1Last Post: 10-18-2007, 12:01 AM
By Inkaddict in forum Kawasaki How To & FAQsReplies: 3Last Post: 10-08-2007, 08:15 PM
By quadzilla in forum Yamaha PWC Performance (2-stroke)Replies: 15Last Post: 07-11-2007, 03:09 PM
By quadzilla in forum Yamaha PWC Performance (2-stroke)Replies: 0Last Post: 06-23-2007, 01:36 PM