DCopp
400 Maxim/Seca Guru
35mm roundslide Keihin from an 80's CR125
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2-to-1 carb
- Thread starter skillzman1
- Start date
DCopp
400 Maxim/Seca Guru
that is pretty much it. I played with the clip position a bit, but until I get more saddle time to figure out a tad more tuning, it is what it is.
Well, after a rebuild of my intake to something more permanent, and frigging around with a few carbs, ended up with the stock carb with a larger main jet and adjustment of the needle position.
I tried a VS34 a guy gave me off a snomobile, and even after changing jets, pilots, needles, it ran way too rich. I am sure I could have figured it out with enough time and an endless supply of jets, but anything out of the ordinary is tough to come by in my area.
So, back to stock, and with the jetting, everything seems to work pretty well.
I changed the intake so it has less of an angle for the left cylinder by installing a gusset. I also installed some rings that sit inside the lip of the intake boots.
The air filter is familiar to some, just an assembly designed for a 1 or 2 bbl carb. I had to build a flange for it that bolted to the carb.
The choke is a headlight knob off a Ford for the time being. I didn't want to cut the original down.
I still need to paint everything and clean up the carb.
I'll post a video sometime.
I tried a VS34 a guy gave me off a snomobile, and even after changing jets, pilots, needles, it ran way too rich. I am sure I could have figured it out with enough time and an endless supply of jets, but anything out of the ordinary is tough to come by in my area.
So, back to stock, and with the jetting, everything seems to work pretty well.
I changed the intake so it has less of an angle for the left cylinder by installing a gusset. I also installed some rings that sit inside the lip of the intake boots.
The air filter is familiar to some, just an assembly designed for a 1 or 2 bbl carb. I had to build a flange for it that bolted to the carb.
The choke is a headlight knob off a Ford for the time being. I didn't want to cut the original down.
I still need to paint everything and clean up the carb.
I'll post a video sometime.
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hardtailed77
Never Finished
Looks good man! Can't wait for the vid!!
yeah, we want vid, we want vid 
Snowsurfer
XS400 Member
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oh! make me one!
skillzman1
XS400 Junkie
nice..runs pretty good!!
schweet! 
I have since reverted to the dual carbs. With the carb that far away from the head, I think the fuel/air mixture was seperating on the way around the intake runner in cold weather. I wanted to drive it now, so I switched back. I think with a shorter run and warmer weather and a bit more work it'd be cool. I still havn't given up on it.im all in!! i sure wish those video links were good still.single carb here i come! im going to give the copper tubing a try.
hardtailed77
Never Finished
I got a carb in the Classifieds for sale if you're interested.....SHAMELESS PLUG!!!! hahaim all in!! i sure wish those video links were good still.
skillzman1
XS400 Junkie
looks interesting....wonder if its fuel resistant??
.ok just to some more fuel to the thoughts. I see that some of you guys are talking about using 2-stroke carbs on your bikes or looking into doing so. I have not seen anywhere in this tread anyone say anything about the safety of doing this. There is an inherent downside to the two stroke carb on a four stroke engine is the there is no throttle return cable and the throttle can stick open “bad day”. That’s why you see the vacuum assist carbs and dual cable carbs on the four strokes.
DCopp
400 Maxim/Seca Guru
it is damn near impossible for a slide type carb's throttle to stick open
gentlemanjim
More Wrenchin than Ridin
Are you referring to these diaphram carbs. I always thought they would work and the jets are adjustable externally. I'd like to lean if they have ever been installed on a motorcycle. Brings me back to my go cart dyas with chainsaw engines. As far as stuck thottle slides and dual cables not a chance of it happening. Many bikes only have a single cable. Here's a link: http://www.tillotson.ie/techinfo-downloads.php
skillzman1
XS400 Junkie
I always thought the second/return cable was more of a safety requirement type of thing....I rode mx for almost 20 years...never had a carb sticking problem.....route the cable wrong and it can get hairy....but that why God gave you a clutch...pull it in and kill the motor.
