Smartcarb SC2 users?
 

Chime in, I?ve just installed one this past weekend and had some questions before I hit up Smartcarb themselves. I put it on a 2011
Ec250, some slight fitment issues, idle questions etc?

Long time user here.

What's up?

After the initial install my idle is high and hanging. The performance is snappy to say the least, the idle just stays around 3400rpms. I did try to adjust it down with the idle screw down to about 2400 and it sounds like it?s camming(bouncing up and down 100-200 rpms). I set the idle screw back to factory once I realized I didn?t really help the problem. I also performed a die-off test and bike did a noticeable surge before shutting off. My initial setup is 85 clicks from full rich.

I also noticed that i have to tilt the carb to make sure I have clearance on the case and the chain. I was curious if y?all had the same fitment issues.

The high hanging idle would normally indicate an air leak, but my old carb ran fine. I?ve got an email to Smartcarb also and just waiting to hear back. I like the idea of this carb and I?m hoping it is just user/install error. I did not install a new throttle cable, it seemed fine with free play. I added the fuel filter they provided and put clear fuel line. I will say the fuel line does have bubbles, not sure if that is normal.
Link to the idle video
https://youtu.be/kbNwh984oq4?feature=shared

Here is a pic of how close it sits to the case, and not being in line with the chain.

I've fit a Smartcarb to a 2011, 2014, and a 2018 GG 300. On all of those there was interference for the cases to the float bowl of the carb and it had to be tilted. In doing that, the float height needs to be set lower (in my opinion). I am going to try a carb spacer from an early 90s CR 250 Honda to see if that helps (I think it will).

I would suggest a new cable as the one I tried to use that I already had on the bike did not work. It resulted in a the revving that you experienced as it did not seat properly in the slide. Get the Motion Pro that is 4 inches longer (10-3000 is the part number I ordered). That allowed the cable to seat properly and not get hung up when I turned my bars.

The SC2 that I have on my 2018 300GP has a needle (AQ-07) that is too rich. I have conversed with SC tech support and will go to leaner needle. However, that is my case, for my mods, my style of riding, and at my altitude (my riding typically starts at 7k feet and goes up over 12k feet). Another rider in our group is having the same richness on his needle for similar conditions but with no mods. A third rider in our group has an SC needle that works fine on his 2019 6 Days.

Even with the setup issues, I am fine with the SC. I bought the 2018 used and it had a Lectron on it. It had no power compared to other GG 300s I had and my friends have. That is the knock on the Lectron, no power on the bottom, mid, or top. The SC2 running too rich feels like it has 8 more horsepower.

Good luck and let us know how you make out!

Eric

I?ll order a throttle cable just to be sure, but I can clearly hear the slide land when I let off the throttle. Also I didn?t have any issues turning lock to lock. The Smartcarb dude got back with me and said the tilting the carb was a GasGas/Rieju deal and shouldn?t affect the carb. Max elevation inside is 2500 feet. I?m gonna do some testing when I get home this evening. I went ahead and ordered another rubber boot between the reeds and carb just to be sure.

The bike rips on the low end now for sure, I?m gonna try some adjustments that Smartcarb suggested and see what happens. I?ll keep yall updated.

Mine had a high idle when I first started the bike.
Gave it a couple miles then turned it down.

I've found that with the S/C, what you think is lean is actually rich.
You just have to play with the metering rod adjustment in either direction..
Just remember where the base line setting is.

What kind of idle rpm can you get? I remember my stock carb running around 2k

Here is the idle at stock, plus turning the idle screw. Also turning lock to lock. This is after 10 minutes riding and warmed up.https://youtu.be/NFvO_t1tE80?feature=shared

Smartcarb dude said to go richer two clicks and use idle screw. It had no effect really. Idle dropped 200rpms maybe

I took the throttle cable loose from the grip also just to rule that out.