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Post by jimthejet on Apr 23, 2005 2:32:00 GMT -5
Here is a no-cost modification to the stock airbox, that results in a 2x + area opening. The flow should be 2x as well, assuming the stock air filter can handle it, and judging by the rejetting I needed, it is likely. Just use a drill to make several holes and then connect them. Finish off with a knife for that "factory" look as seen in the photos. Or, you could use a Dremel Tool.    |
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Post by abe on Apr 23, 2005 8:21:59 GMT -5
Please make the pics smaller. My eyes are popping out of my head  Sorry man |
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Post by chanito on Apr 23, 2005 15:58:51 GMT -5
;D great idea, i just drilled out the slots in the cover untill they got to the airway
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Post by Dandy Dan on Apr 26, 2005 9:48:56 GMT -5
Interesting way of doing it. Mine is like yours except I've got 1 big hole instead of your two smallers ones. I just cut that old tube off on the 3 sides and opened it up as much as I could.
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Post by wainair on Apr 26, 2005 21:56:31 GMT -5
Neat idea!  I greased the seals on my airbox last week, then parked my Ruckus. I drove it for the first time today since sealing the airbox and I noticed it to be much more restricted(which I supose is a good thing, no dust getting through the seams now!). I'll have to try that. I only have 85km on "Yellow Thunder" right now and I didn't want to get any aftermarket parts until the engine was broken in and I knew the final proformance of the engine was. I think, in time, I will get an after market airbox(and some jets). |
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greendale
Junior Ruckster
2005 green four valve fuel injected Zoomer. Variator, Showa shock, kick stand, Metzeler tires.
Posts: 70
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Post by greendale on Aug 7, 2005 17:07:54 GMT -5
Does this change the noise level from the engine?
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Post by jimthejet on Aug 7, 2005 21:32:58 GMT -5
 Only slightly, and probably not as much as swapping the air filter for a lawnmower filter (as suggested elsewhere here and on Battlescooter.com). Without a sound meter, or knowledge that it was done, it would be hard to detect, and since I have two Ruckii, one without the mod, no one else knew of the change.
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Post by Dandy Dan on Aug 7, 2005 23:28:13 GMT -5
It's really not a big deal. It's slightly more 'throaty' off the line. It has a wee more growl but I mean a wee bit. You'll only notice it for a few rides. It's nothing like an exhaust change.
JimtheJet: Is your Ruck with the opened airbox significantly faster 0-30 than the other?
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Post by jimthejet on Aug 8, 2005 23:22:48 GMT -5
 Dan, it is faster to about 20 than the stocker, partly because of lighter variator rollers, and partly because of the increased airflow (although I still have the stock filter, which I felt flowed enough; I thought the box was restrictive). I like the snap I get off idle (and need it to get 265 pounds rolling), and it is much easier to straighten the scooter up from leaned over in a tight turn using the throttle this way. I have not solved the midrange jetting issue, as we have discussed. Good luck on your attempts there.
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Post by fuzzynipple on Nov 7, 2006 22:28:12 GMT -5
Ok, I tried it.
The result on my 06 with 350mi was ok unitl about 10-15 mph, when acceleration became sudden bogging. Seemed like it wanted to stall. Could not go faster than 15mph.
I did not expect this mod to have such a negative effect. Thinking more air would be better. The Ruck became unrideable.
I decided to set it on the stand, and test throttle response, same result.
Full throttle, not possible. anything more the about an 1/8th throttle would result in bogging down. Had to caulk the the hole so I could ride it.
Any idea why this would happen? Would like to try to figure this out.
Have modded Honda cars for 15 years, this is my first 2 wheel/carb experience.
I ride about 12mi a day and wouldn't mind doing stock mods, for better acceleration. I think I am hitting the limiter at 41-42.
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Post by Kami no Chiizu on Nov 7, 2006 23:38:11 GMT -5
I figure the problem is you've increased airflow but not gas flow. You would hafta change your jetting for this mod to be any useful.
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Post by Dandy Dan on Nov 8, 2006 9:53:43 GMT -5
Yeah you're way too lean...I'm surprised you're even getting to 15 mph. Go up too a slightly larger main jet and a considerably larger slow jet.
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Post by Jasper on Nov 8, 2006 19:27:56 GMT -5
Hey DD would you suggest doing jetting first with the slow jet? I remember you saying once that upping the slow jet will give more gas on the top end which the main jet controls so if you go up on the slow jet and its still lean up top then drop in a bigger main jet as well. But if you started with a main jet first, then how do you determine the performance of your mid and low end power?
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Post by Dandy Dan on Nov 8, 2006 20:25:27 GMT -5
It's a bit more complicated than just dialing in one jet and then the other. What you want to do is get both jets kinda close and then fine tune them. For a mod like opening up the airbox you might wanna start with maybe a 40/78 setup as that will give you about 7% more gas on the top end but about 15% more on the low end which is roughly what you need since this mod makes a much bigger difference at low RPMs.
It's true that a slow jet affects things across the board and the main jet affects your midrange and top end so I'd say the best way to do it is to throw ih a 40 slow jet and then dial in your main jet. Then re-check your slow jet and re-check your main if you play with the SJ. Once you got those both pretty good do the idle mix and then check everything once more.
I'm personally not a fan of clipping the diaphram spring. While there may be some room for improvement, it's not the kind of adjustment that's going to be holding you back from dialing it in so if your jetting sucks, look at your SJ and MJ first and don't mess with the spring until it's already running good and you want more torture.
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Post by chanito on Nov 12, 2006 20:59:41 GMT -5
 You dial your main jet first, just forget everything until the main jet is dialed in and then go for the slow jet, and forget about the idle and finally get the idle mixture screw 
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Post by Dandy Dan on Nov 13, 2006 10:30:42 GMT -5
You dial your main jet first, just forget everything until the main jet is dialed in and then go for the slow jet I don't agree...if you do it this way then the slow jet will throw off your top end when you adjust it. A SJ is always open (so a bigger slow jet makes you richer up top) which is why you want it roughly close before you do the MJ. Otherwise you'll have to do the MJ again. With mods like aftermarket intakes you are radically changing your slow jet size (ie. 35 to 42) which is the equivilent on the top end of changing your MJ from a 85 to 90. It's a signficant change and so if you dial in the MJ first, you'll have to do it again if you ignore the SJ. |
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Post by chanito on Nov 13, 2006 20:26:48 GMT -5
You guys are a tough crowd, i will need to steal the diagram of the circuits in the BSS tech page, but yes the idle mixture and slow jet circuits "flow" all the time, but the amount of flow varies a lot due to the vacuum affecting other circuit, i know it is hard to explain and my English sux, but the slow jet Maximum flow is not like the main jet, so it flow more at less than middle throttle and then as the fuel main circuit takes over it will flow less, and at full throttle it will barely contribute any fuel to the mixture, so the way to adjust the carb is to set your main jet first, and ignore the slow jet, until you are happy with the performance. This is "my way" use a marker and make a mark in the edge of the throttle and another in the aluminum part (were the switches are) at idle aligning with the one in the handle, now twist the handle all the way, and make another mark in the aluminum, so now you should have two marks one at rest an another at full throttle, then just make another mark at 3/4 and another at 7/8, go for a ride until the engine is fully warm up, and then find yourself a nice straight and go for a full throttle run, once you are at full throttle, roll the throttle back to the 7/8 mark and accelerate again, you want the jet that gives you the best acceleration in that range and bingo you have your perfect main And leave it alone  Any change in you slow jet should do very little in that range Comprende?
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Post by Dandy Dan on Nov 14, 2006 11:48:02 GMT -5
Hmm...it still doesn't seem like it would hurt to get your slow jet roughly close but what you're saying makes sense. I like your idea of marking the throttle posistions.
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Post by chanito on Nov 14, 2006 19:21:20 GMT -5
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Post by fuzzynipple on Nov 16, 2006 20:05:39 GMT -5
Want to get a main jet an try out this mod again this weekend, but which one?
Will use your suggestions Chanito first, since the problem start around 10 to 15mph/ 1/4 throttle. Hope I don't muck this up. Thank you in advance for your responses.
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