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Old 12-30-2010, 09:27 PM   #1 (permalink)
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Hackjob sidedraft

I needed to fix some fuel issues on my dd/pos samurai, and all the wires/hoses to the stock carb were hacked by the previous owner. My solution was this little round slide mikuni. 34mm is probably way too small for most people, but I'm trying to get a couple extra mpg while I'm at it. $100 brand new from the motorcycle shop through parts unlimited, and ultra simple. I'm still workin on jetting it in (it runs really rich as delivered) but I slapped it on and drove it to town fairly successfully today.




Yes. I know I need an air filter. Workin on it
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Old 12-30-2010, 10:21 PM   #2 (permalink)
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What was your overall impression of it?
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Old 12-30-2010, 10:22 PM   #3 (permalink)
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ghetto fab thread nominee anyone?
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Old 12-30-2010, 10:26 PM   #4 (permalink)
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It's too rich to really tell yet (smoked all the way to town) but I ordered some new jets and will update this once it's running clean. The flow pattern I made in the intake is absolutely horrendous, but hopefully it won't really matter much with such a small carb.

Otherwise, however, I'm already really impressed with the simplicity.

The biggest downside so far is until I securely mount an air intake, the carb shakes a lot and drips some fuel out of the overflow sometimes It's made for a dirtbike/snowmobile though, so I believe that will go away.
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Old 12-30-2010, 10:28 PM   #5 (permalink)
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ghetto fab thread nominee anyone?
I don't mind

edit: the ghetto fab thread needs more pictures lately anyway
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Old 12-31-2010, 10:55 AM   #6 (permalink)
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If you are not already use a jeep bypass filter to reduce your fuel pressure. if you are running that straight from the pump I bet you have too much fuel pressure, hence the rich condition.

They are made for gravity feed so the pressure needs to be 1.5- 2lbs max.

The jeep filter is from a Cherokee with a carbed inline-6. It has a main input and two outputs. You take the larger input and send it to the carb. The smaller outlet goes down hill to the return line. it keeps the pressure from building up.

So far for low pressure systems the jeep filter has been the most reliable to get a good pressure. Do not use a dial type pressure regulator, they are junk. I learned the hard way after trying one even though I knew better.
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Old 12-31-2010, 11:41 AM   #7 (permalink)
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To much hackjob redneckism goin on here. Jeep filter is way to advanced for this set up... I see a hole cut in the hood and a gas tank from a honda trail 50 sitten on top of that carb.
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Old 12-31-2010, 07:20 PM   #8 (permalink)
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why a hackjob? cause he didn't CNC an adapter for the carb? bet all the other bike carbs started out as "hack" jobs.
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Old 12-31-2010, 08:12 PM   #9 (permalink)
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why a hackjob? cause he didn't CNC an adapter for the carb? bet all the other bike carbs started out as "hack" jobs.
x2. I like the fact you're running what you've got, and making it work.
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Old 12-31-2010, 08:29 PM   #10 (permalink)
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total hack job! and i think im gonna try it on my beater sammi i have a 39mm flatslide dirt bike carb and a sammi with carb issues sittin in my yard.
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Old 12-31-2010, 09:28 PM   #11 (permalink)
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The OSHA orange looks good.
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Old 12-31-2010, 11:16 PM   #12 (permalink)
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Thanks for the tip on the regulator, if I can't find a reliable mount for my trail 50 tank I may just try that. I should probably have looked up what the stock fuel pressure was, but since this carb is also sold as a snowmobile carb, I figured it could handle a couple psi (sleds run pumps because the tanks are mounted low). Better to be safe than sorry though
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Old 12-31-2010, 11:41 PM   #13 (permalink)
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I run 4 mikunis and I use a jeep bypass filter and still had to meter it down beyond that or over time the carbs would flood. I put a cheap in line gage and metered it down around 1 to 2 psi and stopped having the flooding issues.
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Old 01-01-2011, 09:40 PM   #14 (permalink)
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Today's update: I leaned out the low-speed circuit a little, and ended up a few sizes bigger on the mainjet. Overall, it carburetes excellent at this point. It is running smooth, and goes 65 on the road (very scary in this unit, the driveline is making all kinds of bad noises now- this is the first I've had it on the road).

It's still "fumey" though, and I will need to play with timing a little because it was never really set right, and I'm not sure if the advance is working.
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Old 01-02-2011, 09:47 AM   #15 (permalink)
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try tying down your carb all that shaking around could be bouncing your float and raising your bowl level
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Old 01-08-2011, 01:44 PM   #16 (permalink)
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So, still no regulator, but I haven't noticed any flooding since re-jetting. I am definitely bummed that it is only getting 10-15 mpg (how can a zuk suck that much fuel!?) but I'm stoked to finally be driving my sammy every day With this newest information, I would probably not recommend the basic round-slide again, I'll try a vacuum-slide (similar to the my-side conversion) next time.
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Old 01-08-2011, 04:12 PM   #17 (permalink)
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either way it's awesome. try to avoid the minitrail gas tank and just go with a plastic DR 50 tank. keep it suzuki
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