newbie jetting questions
Posted March 01, 2003 - 02:15 PM
Posted March 01, 2003 - 03:57 PM
whats going on?
assuming your carby is functioning correctly check out the details in peoples signatures - judging by my own experiance and most Aussie's my bet is both your main and your pilot could be reduced - gotta also think about the position of your fuel mix screw.
the ratio of your PJ:PAJ and MJ:MAJ is important (see ratios in "jetting Q's" but I would start by reducing your main
put the airbox lid on the shelf unless doing lots of marine work
i am currently running a 160
Posted March 01, 2003 - 06:58 PM
Do a search for the 'taffy mod' or the 'kl mod', I think thats what they called it for the 98 and 99 models, and 'BK mod" for 2000 and onwards.(someone correct me if I'm wrong)
You want to get the accelerator pump squirt back down to about half or one second long, or so, and these mods allow you to control this squirt duration via a few different methods, depending on the carby/year of manufacture.
Once you have done this and stopped all the gallons of unwanted extra fuel from pouring in you can then concentrate on the jetting and what needs to be done with that.
Your plug fouling will probably go away as a result of this mod too, and then you may find you dont need to rejet.
In my opinion the accelerator pump squirt has got to be regulated before you can really accurately jet these bikes.
hope this helps you.
Posted March 01, 2003 - 08:15 PM
Snapper- if you need work or advise on the wave blaster talk to Mark at Coast Yamaha as he owned the jetski hire business at Goolwa for 3 years and did all the spannering himself.
Posted March 01, 2003 - 08:34 PM
so does this mean there is a different mod for my '98 or im stuck with the way it is?
Posted March 02, 2003 - 04:08 AM
The BK mod is for 00 and newer and for the 98-99 its the Taffy mod. The procedures have the same result but the process is very different. Taffy mod uses a collar on the AP rod.
Posted March 02, 2003 - 10:46 AM
....you now have a YZ motor as far as jetting is concerned. If it were me the first thing I'd try is stock YZ 400 jetting and then take it from there...
...unless you want to run the air box lid, but not many people do that.
Hope this helps.
Posted March 02, 2003 - 11:36 AM
Hick, i probably should of realised that shouldnt i?! cheers thats a good baseline to go form. hopefully now i can get my WR roosting like it should!
Posted March 03, 2003 - 01:09 AM
Overall its free, reversile and the pipe is still very quiet. I have seen several others who have done the same thing.
Will keep coast yamaha in mind - touch wood the Blaster (which belongs to wife) doesn't need anything done - very clean unit.