Author Topic: Update from Power Apt on cast smart carbs (Read 59858 times)

rablack21 · « **Reply #105 on:** April 01, 2014, 03:58:47 PM »

Hey Jason, did you have them set your carb up with the needle for the CR 500? I know they had a problem initially because the need for stock to 350cc would not work for the CR500 motors. Apparently the CR500 have a unique fuel curve requirement.

JasonB · « **Reply #106 on:** April 03, 2014, 11:57:44 AM »

I've calmed down alot since the ride and issues i had. Was just extremely frustrated when the bike wouldnt start, i just need more time playing with it i guess. Corey said the carb would 'break in' and be easier to start after the first hour or so of use. I did initially use the wrong needle on this bike; they sent the cr500 76 needle in a baggie and the needle for the 310 was in the carb. cr500 motor was SOOOOO LEAN when i got it going it was surging and mad as hell. swapped to the 76 proper needle and it ran much better, i just need to adjust it more and find the sweet spot for this carb and motor. I plan to try the smart carb on the 310 in the next week or so though.

JasonB · « **Reply #107 on:** April 08, 2014, 11:32:44 AM »

tore my 500 motor apart sunday because of tranny issues. I had used the carb on that motor on the trip to little sahara and rode the bike around the parking lot for a few laps and discovered tranny issues so i parked it. someone noticed gas dripping from the mouth of the carb onto the motor so I shut the petcock off and didnt think anymore about the issue. a week later (last sunday) we tear the motor down to fix the transmission and find the pipe is FULL of gas, same goes for the bottom end. I mean like an 8 ounce cup of fluid full. I had tried running the bike again after we pulled clutch apart at little sahara and messed with the shifter and i spent 20 minutes trying to get the bike going. Good thing it wouldnt start, the gas sitting in the pipe and motor could have potentially hydrolocked it. Emailed Liz at APT about the flooding issue, i dont want to have to be turning the pet cock off everytime i stop the engine.

rablack21 · « **Reply #108 on:** April 08, 2014, 11:38:44 AM »

Jason, just checking a couple things. Did you shake the carb when you first got it to hear if the balls inside were free and hear them moving? Also, are you using Castor oil?

JasonB · « **Reply #109 on:** April 09, 2014, 02:00:25 PM »

I run klotz 40:1 which is 20% castor oil. I didnt shake the carb but I have been good about pulling the choke lever up before turning the fuel on. as it is I am swapping the carb over to my 310 bike, the 500 is a new motor and this is just one more thing to be trouble shooting on a $2K motor that I just dont care to fight with anymore. the 310 is reliable and starts first kick everytime, hopefully the smartcarb can handle operating on that bike without issues. I just dont want to tinker with stuff anymore, if i cant get it to work on the 310 than its going back to APT.

rablack21 · « **Reply #110 on:** April 09, 2014, 02:45:38 PM »

I was just wondering because it sounds like there may be an issue will the balls in the check valve. I think it mentioned in the instructions to make sure you could hear those balls moving around. The other issue is through testing they had a few issues with Castor based oils as well. Something about it causing the balls to stick together. Anyway, I hope you get it figured out. These carbs have great potential.

JasonB · « **Reply #111 on:** April 10, 2014, 03:33:14 PM »

you suggesting theres a problem with my balls ?!?!

rablack21 · « **Reply #112 on:** April 10, 2014, 03:54:14 PM »

Quote from: JasonB;31298

you suggesting theres a problem with my balls ?!?!

Hey man, when you start rubbing castor oil on your balls, it starts to go beyond just a powersports lubricant! LOL

rablack21 · « **Reply #113 on:** April 10, 2014, 03:54:58 PM »

You shall now be known as "Slick Willy"! LOL

JasonB · « **Reply #114 on:** April 10, 2014, 05:26:31 PM »

lmao!

havinnoj · « **Reply #115 on:** April 10, 2014, 06:30:56 PM »

Hahaha leave you guys alone for 5 minutes and this is what happens! :lol:

Pumashine · « **Reply #116 on:** June 18, 2014, 05:19:39 PM »

Quote from: JasonB;29100

Contact Steve Liz or Corey. I'm pretty sure the issue that carb is having is with the coating on the tip valve balls, there's two little valves and the first coue runs of the billet carbs had issues with the anti tip valves balls sticking.

Well the manual says when it floods you have to make an adjustment on the floats (page 32) So I measured where the tab was and bent it an additional .060". Hook up the fuel again on to my surprise the floats kicked in. You must then pull the float bowl again to see if you have .775" worth of space from the edge of the float bowl down to the fuel. I measured .735" so it should be close enough. Its not flooding. Big problem I see is the float bowl is missing the drain like all the pics you get in the manual. Can't drain this puppy.

Pumashine · « **Reply #117 on:** June 18, 2014, 06:34:59 PM »

Looks like the bottom end is flooded from the last go around. Tipped it up on the front wheels and pumped a little gas out. Tipped up on back wheels and did the same. I will let it set until tomorrow with the spark plug out. Hopefully the gas evaporates.

Jerry Hall · « **Reply #118 on:** June 18, 2014, 08:11:15 PM »

Quote from: Pumashine;37044

Looks like the bottom end is flooded from the last go around. Tipped it up on the front wheels and pumped a little gas out. Tipped up on back wheels and did the same. I will let it set until tomorrow with the spark plug out. Hopefully the gas evaporates.

Remove the spark plug, turn of the fuel to the carb, turn switch off, put it in 1st or 2nd gear, hold the throttle wide open and push it about 30 ft or until you do not see any vapor coming out of the spark plug hole. The flood should be cleared unless the pipe is full of fuel. If the pipe is full of fuel you will probably have to remove the pipe or lean the bike to the right while standing the bike up to let the fuel run out of the pipe.

christph · « **Reply #119 on:** June 19, 2014, 01:34:26 AM »

Is difficult starting and flooding a common problem on the Smart Carb? I was thinking about ordering one but now I'm having second thoughts.