06-04-2012, 03:48 PM #1
xl 1200 ltd, what else should I doHello, I have just rebuilt my XLT, here is what I have done
SBT cylinder exchange kit.
Stock SBT impeller
SBT wear ring and housing
Mikuni carb kits
120 mains,1 1/2 turns high speed, 110 pilot jets, 1 turn low speed, 1.5 n/s 95 gr spring
Removed air plenum and tube, modified air box by drilling it.
Installed oil pump block off, running 32:1, yamalube
Inspected and cleaned power valves, replaced one, using stock linkage.
Built my own free flow kit using stock exhaust hose and some ss pipe (submersible well pump casing)
D plate and chip.
I think that is it.
After break in I have 120 psi on all 3 cyl.
Machine seems to be running great, throttle is pretty crisp.
Got 57.9mph on gps.
My questions are
Is this speed what I should be getting with this setup?
Is there any other simple mods I should do to get a marked improvement, such as plates, grates, props?
Thanks in advance for any advice.
06-04-2012, 03:53 PM #2
06-04-2012, 04:51 PM #3
06-04-2012, 07:27 PM #4
06-04-2012, 07:40 PM #5
Yeh that makes sense. But I'm not looking to build a 70 mph ski just a good reliable one with a little better than stock performance.
06-04-2012, 08:26 PM #6
- Join Date
- Aug 2006
I would remove the fuel sending unit/fuel pickup unit from the tank and check that the length of the reserve fuel line is not so long as to touch the bottom of the sending unit. It will touch the bottom plate and restrict fuel flow when on reserve. I have found this problem on 6 units I have worked on.
06-04-2012, 08:58 PM #7
- Join Date
- Nov 2009
You're on the right track.
Try a grate, then a plate, then an impellor. If you're at 58 mph now, those should get you 60-62.
06-05-2012, 07:15 AM #8
The way I found the problem was put an outboard primer bulb between the fuel supply and return at the carb, when pumping the bulb, fuel should flow rapidly, through the fuel filter, if it doesnt there is a restriction.
03-31-2013, 10:52 PM #9
- Join Date
- Aug 2007
Yamaha xl 1200 pump stuck
HI: I just read your post from 5/18/2012 while searching for info on my problem. Have a 98 XL 1200 can't get pump off. Liner is binding on the impeller.
You mentioned in your post that you cut the shaft tube...where exactly did you cut it??
04-01-2013, 12:40 PM #10
Stevmotox - I think he's referring to the "radiator hose" type connection between the rearside of the midwall and the point the drive shaft goes out the hull to the intake tunnel. The shaft is in there. Seems kinda last-resort though, cutting the shaft. Unless you know its bad and plan on replacing it anyway.
If you have the motor out or otherwise have enough room to do so, can you take off (unscrew) the midshaft coupler and try to drive a large (1/2" or so) rod down the midshaft hole from inside? That could break it free maybe - just a thought.
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