Anybody here used the Cast Version of the APT Smartcarb yet?

[Jakobi]

Leave it where it is. Run it and then adjust after some time. Is it new or used? Billet or cast? Very sensitive to the slide height. Keep it low.

[fst96se]

It is cast, and brand new.

However, I showed a friend the carb and the first thing he did was start turning the knob on top. Don't know how many turns in what direction, unfortunately.

[pscook]

Originally Posted by fst96se

It is cast, and brand new.

However, I showed a friend the carb and the first thing he did was start turning the knob on top. Don't know how many turns in what direction, unfortunately.

The knob only affects rod height when the slide is all of the way at the top (WOT). Turning the knob with the slide down should be fine.

[Jakobi]

Originally Posted by pscook

The knob only affects rod height when the slide is all of the way at the top (WOT). Turning the knob with the slide down should be fine.

Exactly. It actually takes quite a bit of finess to lift the slide, engage the clicker, and get it to turn, or at least it did on my billet model.

Try to avoid making any changes off the bat. Its claimed they need a break in period so be prepared for it to run like crap for the first couple rides. If you're lucky it'll start working well after that.

[desertgasser300]

In looking at the APT website, they recommend ordering a 36mm carb for a 300cc for enduro riding. Most stock sizes are 38mm, what would be the reason for this recommendation?

[fst96se]

Originally Posted by pscook

The knob only affects rod height when the slide is all of the way at the top (WOT). Turning the knob with the slide down should be fine.

We wondered why we couldn't really feel any clicks!

[Jakobi]

Originally Posted by desertgasser300

In looking at the APT website, they recommend ordering a 36mm carb for a 300cc for enduro riding. Most stock sizes are 38mm, what would be the reason for this recommendation?

The 36mm offers a better spread of usable power (prefered for enduro), where the 38mm will make power outright power but not as good in the low to mid rpm range.

TSPs dyno work with the Lectrons shows that the 36mm gained more power across a larger range of revs than it gave up in peak HP. I could try and chase up some graphs.

[fst96se]

Started the bike with the carb tonight... Seems to run just fine! I probably won't be able to really ride it until Saturday.

I am stoked!

[john r b]

My cast 38mm come in the mail yesterday, it sure does look pretty. I hope to get it installed before this weekend.

[fst96se]

Warmed the bike up and rode it a little on the street today.

I have an idle issue. The idle stays pretty high for a bit, starts to idle down and seems to idle rough, then slowly settles into a normal idle. If I adjust the idle screw to idle normally, it will stall pretty quick.

Any thoughts?