10-03-2010, 09:19 AM #1
Need help adjusting carbs on 1200r
Ive just put flame arrestors and 1.5 needle seats in with T handle adjusters. also have reed stuffers and heads whats the best settings for high and low settings thanks for any advice.
10-03-2010, 09:42 AM #2
Have you read any of the threads regarding carb settings in the how to section? there several at the beginning of the section covering this exact question.
10-03-2010, 11:07 AM #3
No still kind new to the hulk were and how to get there would help.
10-03-2010, 11:11 AM #4
10-03-2010, 07:49 PM #5
Thanks guys for the link. my carbs are stock i have the low screws at 1 turn out and the high screws at 1.75 turns out. when i go from idle to half throttle it does great but from idle to full throttle it hesitates for a moment till you let off then hit it again then it pulls hard im going to check piston wash tomarrow think i may need a little more on the lows.
10-03-2010, 07:55 PM #6
Here is a general guide to help tune. This is written for the Polaris but the tuning apply's to all carbs.
Tuning Tips for Girls
Start with the screws set at 1 turn out, and tune with the tachometer for peak Rpm, then stop there and count the number of turns on the high speed screws. Write this down on a piece of paper.. Then turn the high speed screws in all the way and open them to 1/4 turn open. (Now you will be testing starts only, so no more big high rpm trips around the course). You are only turning in the high speeds to allow you to easily tune the low speeds.
Now check the low speed screws and set them at 1 turn and do a practice start; To test the low speed setting pretend that you just jumped the start and you have to start with no holder. Hold the ski by yourself and hold as many Rpm as you can (don't blow it out first for testing) and then nail the throttle hard.... NO FARTHER THAN 50 FEET, as you are only testing the start response
If it blubbers like a schoolgirl trying to guzzle a quart of beer, then it's too rich on the low speed screws..
If it falls flat on the line (like someone punched you in the stomach).. It's too lean on the low speed screws.
When you like the acceleration off the line, stop there and count the number of turns on the low speed screws. Write this down on a piece of paper.. Then re-set your high speed screw where they show the best peak Rpm earlier and try both a start and a peak Rpm run...
It will probably "blubber" a little off the line... DO NOT turn in the low speed screws... Instead, go back out on the course and fine tune for peak Rpm again.. The blubbering off the line is caused by having too much fuel in the high speed circuit... Write down your new high speed setting on the piece of paper along with the best low speed setting that you found earlier, this will be your base-line carburetor settings.
If the high or low speed screws are open more than 11/4 turns, then you need to swap to the next bigger jet.
If the high or low speed screws are closed all the way, then you need to change to the next size smaller jet.
*** If no matter what you try, it still won’t leave the line without falling on its face "lean bog"... Then try the next size lower pop-off spring in the carbs... Don't be afraid to try #95 or even #80 gram springs..
10-03-2010, 09:46 PM #7
Does the motor have to be pulled to get the carbs off the motor? My father is doing the work on my ski and says the motor has to be pulled out to get the carbs off...surely this can't be true?
10-03-2010, 10:01 PM #8
NO....you need to pull the exhaust stinger....and to make it a little easier, the u-pipe also if you still are using the factory air box.
10-03-2010, 10:24 PM #9
- Join Date
- Jan 2006
- Texas City, Texas
Let's be clear on the jetting, because there is lots of room for error in a 1200r. Did you disable the accellerator pump? Just as Oside Bill was making reference to, there is a very defined formula for jetting when you go to aftermarket flame arrestors and higher compression, and things change as you add aftermarket go fast parts.
10-03-2010, 11:24 PM #10
adjusting the low speed screws does nothing more than adjust your idle speed, it won't help with your hesitation
yes as already suggested please post the complete details of all mods to the motor
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By JeffSki in forum Yamaha ClassifiedsReplies: 16Last Post: 07-10-2008, 09:27 PM
By maxadrenaline in forum Yamaha PWC Performance (2-stroke)Replies: 4Last Post: 02-05-2008, 08:01 AM
By sic fish in forum Yamaha PWC Performance (2-stroke)Replies: 1Last Post: 03-24-2007, 10:16 PM
By mile_hi_1300 in forum Yamaha PWC Performance (2-stroke)Replies: 2Last Post: 08-04-2006, 01:01 PM
By MDGPR in forum Yamaha PWC Performance (2-stroke)Replies: 11Last Post: 07-11-2006, 07:47 PM