justrandy said:What's the best carb size for the webcam .390 cam type rider?
justrandy said:Why not a non-cv type?
justrandy said:I thought the whole idea of flatslide was bottom end???
Here's a quote from the Sudco catalog, "Mikuni’s original flat valve (flat slide) carburetor, the TM Series Carburetors provide significant performance improvements over older design round slide carburetors. Air flows faster and smoother through the TM Series venturi due to the flat slide configuration and the jet blocks which help create a smoothbore effect. The high velocity of the air flow means a stronger vacuum at the needle jet, providing more precise metering and better throttle response."
Faster flow means more bottom end and probably less top end.
YamaRider said:I've noticed with the CV carb on my dr350s that they really do have crappy throttle response compared to most carbs.
jasonp said:I was just going to pull that up griff, great response.
Griff said:YamaRider said:I've noticed with the CV carb on my dr350s that they really do have crappy throttle response compared to most carbs.
A lot of DR350 carbs were absolutely HORRIBLY setup at the factory. Even if you keep the stock airbox and exhaust, a proper jetting will clean it up enormously.
My old DR was the same way, as is A LOT of the guys DR's on my site. Register and maximum-suzuki.com , you wont find a better DR forum for tech stuff anywhere.
justrandy said:I found with the stock carb I could open the throttle up fully and then start counting before it revs all the way out. With the 38mm mikuni roundslide I have now, the response is instant and lowend is brutal. Just punch the flipper and the front end comes up.... No delay or stumble.... Even with this air filter and no box: http://www.knfilters.com/search/product.aspx?Prod=RX-3770
I'm waiting on another needle to see if I can refine the off-idle cruising, but for trail busting it seems there's little room for improvement (other than a cam and more rpm). I think a dial-a-jet would probably clean up any inconsistancies in fuel mixture and add even more throttle response.
jasonp said:I don't know if I would call the low end brutal for a 350 for what ever mod you do but that is totally cool!
Sounds like maybe you want to richen up on the pilot jet?
justrandy said:I can't.....
....a puzzle to me.
justrandy said:jasonp said:I don't know if I would call the low end brutal for a 350 for what ever mod you do but that is totally cool!
Sounds like maybe you want to richen up on the pilot jet?
You guys are just used to it, I'm coming from a 250 quadsport so... But you have to admit, warriors are torquey for their size.
I can't go bigger with the pilot because my air screw will fall out. My first though after that was to get a bigger needle-jet, but I figured that would just screw everything else up. So, I've been thru a 6DP1, 6DH3, 6DP17, and a 6F8 needle. Waiting on a 6F5. If that doesn't work, I'll probably have to change needle jets and start over with the needles. My slide is the middle-of-the-road 2.5. I doubt I'll need to change it.
The 6DP1 came with the carb and had good bottom end, but wouldn't rev out even on the last clip (don't remember if it was top or bottom clip).
The 6DH3 was close, but lacked the bottom end of the 6DP1
Can't remember how the 6DP17 was.
The 6F8 was the last one to try and its pretty good on both ends, but the off idle is too rich... So, the quad either goes full-balls or barely at all... There's no inbetween. Kinda hard to keep it on the trail like that, lol. The front wheels push too much with the back 22's lifting them everytime I gas it.
Anyway, not bad for a $100 carb and a $75 air filter. Think I got the FMF for $50, but had to weld it back together since the guy cut it apart for some reason.
I highly recommend those dial-a-jets though... They're awesome. But I want to get the jetting close as possible first... Its like a puzzle to me.
justrandy said:The pilot jet is right on. The screw is an air screw, not a fuel screw. Turning it out adds more air. So, if I go to a bigger pilot (which I did and had to take back out), the air screw is too many turns out for the spring to hold it in. So, therefore, my pilot is as big as it can be.
My main is right on as well. I have an o2 sensor hooked up, so I can tell what's what. I just have a little rich spot as soon as I open the throttle. Once the throttle is opened, everything is good. Just the part of the needle that controls the first part of the throttle opening is too small.
My o2 sensor.
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