09-05-2013, 09:13 AM #1
Would an 8 pound difference in one cylinder create a slightly rough idle?
Just curious on your thoughts.
09-05-2013, 09:30 AM #2
8lb difference is nothing as long as your lowest number is still within spec.
09-05-2013, 09:43 AM #3
09-05-2013, 09:54 AM #4
13.6 is a lil lean, bump fuel pressure up to get 13.2 @ idle to see if that helps, if u have a pressure reg.
or leaky intercooler
09-05-2013, 10:28 AM #5
I've seen a difference in compression #s when carbon was built up on the valves.
Maybe you have some build up?
Rough idle could be some sub par fuel or partially clogging Injectors..
Sweet looking machine you've got!!!!
09-05-2013, 03:10 PM #6
Thanks for the replies.
I want to do a leak down test. What is the procedure you guys use as far as getting each cylinder on tdc?
I have the manual and its is very vague. It seems like you use the starter to bump the motor around and then use a tool on the drive shaft w the pump out to dial each cylinder in?
What do you guys do ? I need a pros advice. Thanks !
09-05-2013, 03:14 PM #7
I prefer to just put #3 top dead center and pull the rocker shaft to be sure all valves are closed.
09-05-2013, 03:26 PM #8
09-05-2013, 07:56 PM #9
09-05-2013, 08:06 PM #10
- Join Date
- Aug 2013
Are you trying to do a leak down percentage test? or air each cyl up to see if the air Leakage is coming from the Intake, exhaust or crankcase? 2 different test. Requiring 2 different tools.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By scotty821 in forum Yamaha Sport BoatReplies: 2Last Post: 08-20-2008, 07:05 PM
By scorp in forum Polaris Open DiscussionReplies: 3Last Post: 08-18-2008, 03:15 PM
By dirt dummy in forum Polaris Open DiscussionReplies: 10Last Post: 05-26-2008, 07:43 PM
By Chrisrokc in forum Yamaha PWC Performance (2-stroke)Replies: 5Last Post: 09-17-2007, 10:37 PM
By rbridges in forum Polaris PWC PerformanceReplies: 19Last Post: 03-31-2007, 10:05 PM