CR125 Carburetor Problems

Sam Zavaglia · Posted: Thu Jan 17, 2013 6:19 am Post subject:

Honestly it's running great, so responsive off the turns, I'm now arriving to the race track ahead of all the competition.

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Todd Kageals · Joined: 15 Jun 2012 Posts: 271

Benn,

The Dellorto is reported to supply 55 l/hr at 1.45 PSI. From what I have read, the other pumps flow less than that although the pressure is higher. I don't know much about pumps but on the surface it would seem that with just a slightly smaller seat, the Dellorto should do fine supplying enough fuel....no?......If you think that would work, I'm just going to go with a smaller seat and leave what I have already setup. Having said that, I am going to follow your advice and move the Dellorto lower to see if that fixes it first!

joseph hollinger · Posted: Thu Jan 17, 2013 11:22 am Post subject:

Whatever you do, don't try the pump around that you already own.
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Jim McMahon · Posted: Thu Jan 17, 2013 11:32 am Post subject:

Would have been nice if people listened to John Denman and others back in the day on the Dell'orto VHSH30. Superb carburetor for a 125cc shifter kart.
Easy to say in hindsight of course. Many may argue that the VHSH30 is more expensive but when you start getting into pumparounds and GFS systems I think the tried and tested Dell'orto makes a lot of sense.

Anyway, carry on.
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Jimmy McNeil · Posted: Thu Jan 17, 2013 11:42 am Post subject:

Todd Kageals · Joined: 15 Jun 2012 Posts: 271

It's not a matter of TRYING the pump-around I have. It worked on my other kart, I am sure it will work on the GP10. The reason I wanted the Dellorto was the simplicity and maintenance (none). 1 line to the pump, a 3 inch pulse line, short line to the carb. Pump nicely tucked in behind the cylinder with the pulse fitting pointing down to drain the oil. Besides, I need that pump-around for my other kart! Wanted to try somethign different on this one.

Steve Buckner · Joined: 22 Apr 2003 Posts: 839

Sam, You should try the engine mount, it will offset the drivers weight on that side and give you more room for the 2 piece exhaust pipe that someone is testing for us. You will have to pull the motor to change the oil though.

Jason Berry · Advertiser Joined: 29 Dec 2001 Posts: 295

Jimmy McNeil · Posted: Thu Jan 17, 2013 2:05 pm Post subject:

Todd Kageals · Joined: 15 Jun 2012 Posts: 271

Just an update.....I pulled off all my beautiful plumbing and the fuel pump. Hacked up my perfectly fit fuel lines and moved the fuel pump to the floor of the garage (as low as you could possibly get it without digging a hole). The engine did run a little better but that may have been because I pointed the lower vent tube straight down allowing excess fuel to drain onto the floor instead of it getting pushed up the all three of the vent tubes. With the vents setup that way, I was able to get the engine to idle and it did not sound bad reving up. Now the bad news.....I still get a constant stream of fuel from the bottom vent line as long as the engine is running. It appears that the Dellorto is still blowing the seat. So.....I probably need a smaller seat and yet another fuel pump(s) or yes......I could just give up and buy another pump-around setup like Clark told me to do in the first place!

Sam Zavaglia · Posted: Thu Jan 17, 2013 3:24 pm Post subject:

Todd Kageals · Joined: 15 Jun 2012 Posts: 271

So....I moved the pump to all the way down below the engine and got no change to the fuel overflowing the bowl so I decided to adjust the float level. I adjusted the float 1.5mm to 17.5mm (16mm is spec on the PWK). I fired it up (started right up....barely even pulled the strap). I let it idle for a while, blipped the throttle several times, idled it a while long, held the revs high for a bit and NO FUEL FROM ANY OF THE LINES!!!! I even moved the pump back where I originally had it (mounted to the head.....a little higher than the carburetor) and still no fuel flowing from the vents or overflow. I tested it as much as you can on the stand. I won't know for sure if the Dellorto works well until I track test it but as of right now it looks good!!!!

Thanks for all the help everyone.

Going to try to get it down to MMX for a good test once it warms up! I'll let you know how it turns out.

Thanks again.

Todd

Todd Kageals · Joined: 15 Jun 2012 Posts: 271

Sorry for the double post. I must have hit it twice before it was ready!

Jeff DeMello · Posted: Sat Jan 19, 2013 5:45 pm Post subject: