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Joined
3/31/2014
Location
Mackay QLD
AU
Edited Date/Time
12/7/2017 2:54am
Has any body tried either a Smart carb or a Lectron on their bikes?
The smart carb is a cool looking set up, internally vented so vent hoses or leaks when tipped over, self pressurising, adjustable needle height with a clicker adjuster and no jets . Would they be any good on something built for all out power or are they more of a maintenance free type deal for a trail bike type deal? they now make a 38mm cast version which now puts one into my price range.
Lectron doesn't have main jet or pilot jet just an adjustable power jet? I've seen them getting around on some tough bikes.
How would these go versus a well jetted standard carb? Theres a company making billet metering block inserts that retro fit into the Keihin airstrikes that looks impressive with equally impressive numbers to go with it, I was contemplating getting that but the price is similar to a new cast smart carb.
Never done much with jetting and fine tuning two strokes so getting one running crisp, revving hard and making clean power is something i'll have to learn along the way but not having jets to tune sounds really nice.
The smart carb is a cool looking set up, internally vented so vent hoses or leaks when tipped over, self pressurising, adjustable needle height with a clicker adjuster and no jets . Would they be any good on something built for all out power or are they more of a maintenance free type deal for a trail bike type deal? they now make a 38mm cast version which now puts one into my price range.
Lectron doesn't have main jet or pilot jet just an adjustable power jet? I've seen them getting around on some tough bikes.
How would these go versus a well jetted standard carb? Theres a company making billet metering block inserts that retro fit into the Keihin airstrikes that looks impressive with equally impressive numbers to go with it, I was contemplating getting that but the price is similar to a new cast smart carb.
Never done much with jetting and fine tuning two strokes so getting one running crisp, revving hard and making clean power is something i'll have to learn along the way but not having jets to tune sounds really nice.
I tried the 38mm cast on my rm144 but it didn't pull it well, the 36mm billet they replaced it with absolutely rips.
Since it's larger than stock carb, you can only use it with the stock intake on the rm125
To me, it's not as set it and forget it as people made it sound. My application might be more sensitive on the 125, so requires more tuning.
The Shop
I am currently running a PWK with the STIC (the billet metering assembly you mentioned) and I won't be changing this setup. It absolutely produces more power everywhere and I was shocked the first ride with it. You have to go up on your main and possibly a 1/2 clip richer on the needle but that is about it. Harris Performance sells them if you want to give it a go. I definitely recommend it over any metering rod carb and Harris will help you get in the ballpark with jetting. It also runs really well with elevation and temperature changes.
http://www.hpracedevelopment.com/stic-metering-block.html
I've never come across something that is honestly bolt on power with so many people to back it up. Costs almost as much as cast smart carb but I don't think the smart carb will be a power upgrade.
I was amazed at the over rev I gained with the stic.
I wonder how hard it would be to rig up a PWK to my RM125 so I can do the same mod and gain some power on that????
It was a pain to setup, since it just wouldn't pull clean, so I ended up running a #4 slide compared to a 6 or 7 most bikes run. Additionally, the straight taper needles often detonate, I used a NOZI needle from a ktm.
The problem with the pwk is the carb is so much longer than the stock Mikuni it leaves a lot of dead air space between the reeds and the needle.....I think this is why so many works bikes had the choke removed and the front of the carb machined off back in the day.
I am skeptical of more power, even if the bike runs crap at partial throttle, you are always gonna make max power when wide open.....lean the main until it detonates at wot and then go one richer.
Pit Row
I can promise you it is not just a "feeling" of power/speed. I will say however that the throttle response is greatly improved. So much so I added a flywheel weight for traction.
At a bare minimum if all the claims about it are bullshit, it would then be exactly the same as stock
Do you know which set up it was and bike brocsdad? There was some push from kpr to use a set up that was too lean, but I always saw over rev gains that way due to pipe temperature.
Personally the original set up I was sent has been a stellar dyno performer with trackside ride reports that are what had me most surprised and interested in the product... It just surprised the hell out me a bolt in could dyno well and feel as much better as it did... which drove me crazy so I sent a couple out to a few customers I trust to give their no bullshit opinion and their ride reports mimiced mine..
And I have no reason to think its better just because I paid a bunch of money for it. I am one of the ones Derek sent one out to test it. And it honestly does work.
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