January 27, 2015 at 11:46 am #41171
Just wanted to make sure my pumparound is right…
From the fuel tank pickup, the line goes to the fuel pump “IN”. Then a single line comes from the fuel pump “OUT” to a Y. The unrestricted line (shorty) goes to the carb. The other side of the Y has the top of a spark plug twist-on in it to act as a restrictor, then goes back to a 2nd vent nipple on the fuel tank… Sound right? Pic below… Thanks! ~Ted
January 27, 2015 at 12:29 pm #41182
Uhhhhh Ted, That’s not a pump around system. Should work just fine though, I’ve never needed a restrictor in the return line but many use them.
January 27, 2015 at 12:43 pm #41185
Here is a good pump-around diagram:
Mine was built by SRS and is a bit different. There is a “Y” split after the “Out” from the supply pump. One branch goes to the carb “in”, and the other goes back to the tank with a restrictor (unsure of restrictor size). Then there is of course the return line from the carb that goes through the return pump and then to the tank.
January 27, 2015 at 2:51 pm #41188
Thanks for the correction on the terminology, glad it will work. Thanks! So, what is my type of system called? :)
January 27, 2015 at 4:28 pm #41191
Your’s is a single pump fuel system. As Greg said, it should be fine.
A pump-around system uses 2 pumps and a modified carb to work with 2 pumps. 1 pump is for feeding carb and the other to scavenge the excess and send it back to the tank.
Here’s a pic:
January 28, 2015 at 3:07 pm #41291
Ted, everything looks good, up until the “T”
The inlet is fine. Switch the two outlets. Put the carb outlet line on the barb facing down. Put the tank return line on the horizontal barb. Remove the restrictor in the tank return line. Make the carb feed line shorter so it is a straight, verticle tube, with minimal bends.
This will give you as close to a gravity feed setup as possible. Seeing as that carb (and all ‘moto’ carbs) are designed for a gravity feed setup, they are VERY picky about getting too much fuel pressure.
I will take a picture of my setup so you can get a better idea of the fuel line orientation. It has worked great so far with no starvation or flooding issues.
January 28, 2015 at 6:24 pm #41302
I have a “straight tee”, so I’ll put that on there with the base of the T down to the carby and the pump send and tank return on the top arms… Thanks for the tip.
January 28, 2015 at 6:29 pm #41303
This should be better:
January 28, 2015 at 7:15 pm #41306
January 28, 2015 at 8:07 pm #41308
Thanks for the tip…. Now I just hope that the carb isn’t all gummed up and that she fires right up. I wonder if a Honda 80 RCE pipe will fit this ‘Zuki….
January 28, 2015 at 8:22 pm #41310
You know you would be better off cleaning the carb now, rather than later… lol
Save yourself the headache! You are going to have to do it anyway.
Oh, and I always find a nice shot of starter fluid down the carb throat really makes the starting procedure a lot quicker. No need to prime the entire fuel system.
January 29, 2015 at 1:58 pm #41363
Well OK, Tim….
But you really should not use starting fluid in a 2-stroke motor. You have to remember that the intake charge goes through the crank-case. Anything other than fuel and the appropriate oil going in there can have a detrimental effect on bearings. The stuff can be corrosive, and it is volatile, of course. Unlikely, but still possible that it could ignite under the piston, instead of on top of it.
January 29, 2015 at 5:48 pm #41377
I wasn’t going to use starting fluid because of the lack of lube, but I was also going to dump some marvel mystery oil / gasoline through the plug hole before I fired it too, so it wasn’t a “dry” spinover to start.
I’m looking forward to my first road course shifter kart….I played with a 60cc on a 1/10 asphalt oval once… this will be better!
Swiss Hutless RM80 shifter… Almost ready to fire!!
Posted by Ted Hamilton on Thursday, January 29, 2015
January 30, 2015 at 5:57 am #41383
2-3 seconds at less than 3k rpm is NOT going to hurt anything. And most off the shelf starting fluids have lubricants mixed in.
February 1, 2015 at 12:16 pm #41507
February 1, 2015 at 2:38 pm #41515
Good info, Benn…. think I will stick with my Tee system, and add restrictor if I’m seeing starvation issues.
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