Thread: 750 Carb question
09-26-2008, 07:39 PM #1
- Join Date
- Jul 2007
750 Carb question
I kept it between 4800-5200RPM and everything was fine. I did NOT give it wide open throttle as I haven't rebuilt the carbs yet. When I went over 5200RPM or 42MPH and kept it steady with the throttle, I noticed it would start to loose power (bogging) If I backed off the throttle it would stop. Seems like a fuel delivery problem?? When it happened at first, I thought I lost the front cyliner!
The power came back once I pumped the throttle a bit though. Does this sound more like a dirty carb, tunning issue, or fuel pump???
I have also not installed the tripple outlet fuel pump yet! I'm parking the ski till I get this figured out. I looked down the spark plug holes and the front piston looks like the hole has started. It has a perfect circle indent right where the spark plug sits. Should I be using the BR7's or 8's for spark plugs?
Looks like I'll need to order 1 piston for the front, 3 diaphragms for the carbs, and install the tripple outlet fuel pump. Any other suggestions??
09-26-2008, 07:48 PM #2
Sounds like you have it nailed down. Clean the carbs go thru the entire fuel system from tank pickup to fuel selector to carb screens. all the info is in the tech section.
09-26-2008, 07:51 PM #3
The front cylinder being lean is typical of a fuel pump issue. Not delivering enough fuel for all 3 carbs. I'd clean the carbs, and get the triple pump. Then I'd go through the rest of the fuel system. Check and clean the fuel filter, and check the gas cock. If I had grey fuel lines (Tempo brand), they would be replaced. They cause a green gunk to clog things when the inside of the lines start to break down.
09-27-2008, 01:13 AM #4
- Join Date
- Oct 2006
- Cleveland OH
I'd say all new fuel hoses. (about $20 to replace) Be sure to look for the in line restrictor in the return hose and re-install it.
Consider new needles and seats for the carbs as well as new springs.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By excalibur1031 in forum Polaris Open DiscussionReplies: 1Last Post: 09-23-2010, 12:27 AM
By stuby in forum Polaris Open DiscussionReplies: 3Last Post: 06-01-2009, 09:53 PM
By danvhp in forum Polaris PWC PerformanceReplies: 17Last Post: 09-18-2006, 10:21 PM
By ozzygp in forum Yamaha PWC Performance (2-stroke)Replies: 4Last Post: 09-13-2006, 02:38 AM
By Tommy Gun in forum Yamaha PWC Performance (2-stroke)Replies: 2Last Post: 06-28-2006, 10:53 AM