Thread: Y2K GP1200R Fuel Delivery
08-09-2012, 10:56 AM #1
Y2K GP1200R Fuel Delivery
Het folks! This seems like the place to be for expert advise. My GP is on it's second burnt engine cylinder (#3 rear). I believe I have identified the cause to be improperly balanced carbs but....I have a theory that the stock fuel delivery method is causing my prob. The fuel is delivered "serially" along the fuel rail. The fuel hits carb#1 first, then passes on to carb#2, then onto carb#3. My plugs are showing "perfectly" how each cylinder is running. Cylineder #1 = slightly rich, cylinder #2 = almost perfect, cylinder #3 = very lean.
I have a design idea that splits the main fuel line 3-ways and delivers fuel to each cylinder in "parallel" thus providing each cylinder with the same amount of fuel. Wondering if anyone has done this (noticed this) before?
Now, onto a cylinder swap out with SBT.
08-09-2012, 10:59 AM #2
- Join Date
- Sep 2011
- Seattle, WA
Theres a "how too" on running dual fuel lines and proper carb tunning. I would head over to that section.
08-09-2012, 11:46 AM #3
- Join Date
- Aug 2005
I have run a triple feed into a ported triple piper but it is overkill. Dual feed is enough for any setup. If your ski is stock then there is nothing wrong with just running a single feed.
Not sure how the carbs became "improperly balanced." I'd think it was more like #3 carb is gummed up causing that cylinder to run lean.
08-09-2012, 12:30 PM #4
Thanks for the tips. I'll check the how-too section. When I installed the SBT engine 4 years ago I also rebuilt the Mikuni carbs and set them
all the same. Ski ran great. Take another look at the plugs and see how each plug gets progressively leaner? This make me suspect the fuel
delivery method. If #3 was gummed up, I would suspect #2 and #1 to also be gummed up.
08-09-2012, 12:44 PM #5
08-09-2012, 01:00 PM #6
Now, this is what I'm talkin about! Might be overkill but I'll sleep better at night.
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