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Post by Dandy Dan on Jan 4, 2008 16:00:15 GMT -5
Last time I checked the BSS had a large interval kit (i.e. 75, 80, 85...) and they had a tight interval kit (75, 78, 80, 82...). I've bought both of those kits from the BSS and then I bought an 88 jet from my local Honda dealer. The part number for the stock jet is ends with ".....0750". If you replace that 75 with an 80 then that will be a valid part number for the 80 jet. For the in between sizes (i.e. 78) the actual jet size is 77.5 (or 0.775mm) so sometimes it's called the 77 and sometimes it's the 78 depending on how they round it. Same goes for the 82. I think normally they round the 2's down and the 8's up so it would be 75, 78, 80, 82, 85, 88 etc).
Anyways, that part number formula works for pretty much all the jets except for whatever reason the 88 jet part number is a bit different...and so is the jet itself.
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Post by varroa on Apr 25, 2008 0:43:38 GMT -5
thanks, DD. looking at the pictures of the How-To, i thought: is it possible to do all the jet swapping without disconnecting coolant cables? that would definetely a) save time, and b) save spilled coolant. Timber, are you sure that stock SJ is 38? i was positive it's 35... man, i bought a wrong jet, then.
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Post by varroa on Apr 27, 2008 16:14:27 GMT -5
here are some new findings:
1) YOU DO NOT NEED TO REMOVE coolant and fuel lines. just disconnect the intake, disconnect the carb from the manifold, disconnect the electric wires, drain fuel, and open up the carb.
2) if you have K&N covered filter, and NCY-R exhaust, at almost sea level, you will need 90 or 95 MJ (maybe, 92)
3) slow jet does not need to be changed for the engine to run perfectly. i have stock SJ and cruise at about 43 mph, and 46 in a tuck, on flat ground, with a little or no headwind. just as chanito advices, adjust the mixture screw.
4) wow, i can hear the engine through the intake now!!!
5) jetting is not time consuming, if you follow my finding ยน1. it takes around 10 min to swap a jet.
6) after you swap a jet, make sure to turn the key on, let the fuel pump pump the fuel, then switch to off, then back to on, then off again. do that 3 or 4 times fot the float bowl to fill up with gas, and only then start. let the carb sort itself out by gently opening throttle a couple of times and let it idle for a minute or so, and ONLY THEN start trying out the performance of your new jet.
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Post by Dandy Dan on Apr 29, 2008 10:21:59 GMT -5
Great stuff Varroa! It's true that you can leave some of the hoses connected to save time and your other findings are spot on as well! Oh and the stock slow jet is a 35, you are right Varroa. Sounds like you're becoming quite a rejetting expert. 43-46mph is solid performance
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Post by ozzie84 on May 27, 2008 14:01:22 GMT -5
you have no clue how much this helped me...thanks a crapload
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Post by cuzinit on Nov 7, 2008 0:54:41 GMT -5
Have you found a publisher yet for Ruckcs for Dummies? Excelent job on how to do this even if I ride a Metro.
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Post by allrukdup on Nov 18, 2008 21:49:58 GMT -5
A couple of questions for timberwolf...
Where may I find your bracket mod info?
And about the el fuel pump. You mentioned that you turn on and off the key to prime? So the fuel bowl will not fill with a single turn of the key?
Thanks!
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Post by allrukdup on Nov 22, 2008 23:06:35 GMT -5
Thanks for the tip! The turning on/off worked but I had to do it about 12 times before it would run without bogging. Runs like a top now!
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Post by Dandy Dan on Nov 30, 2008 1:56:02 GMT -5
Good to hear you got the primer figured out! If you listen carefully when you turn the key on. It should click 15 or 16 times and then stop. Then you need to flick the key off and back on to repeat this. I find I normally need to do this 3 or 4 times to fill the bowl. About the 3rd or 4th cycle, you should hear the clicks get quieter, which means it's basically full.
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Post by varroa on Apr 5, 2009 23:24:00 GMT -5
CHANITO, i need your help!!! sorry for not posting here anymore.
i have a problem with the stock carb. the jetting used to be spot on since i got the K&N filter, but now, almost a year later, i started having problems. nothing changed, except maybe the air filter got a little dryer.
the problem is, the engine bogs at the 1/3-2/3 throttle range. when i take off, the engine also bogs even at WOT, but as i get to about 10 mph, the bogging stops and the engine starts pulling hard, unless i reduce the throttle to about 1/2, then the bogging starts again.
am i too rich or lean?
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Post by chanito on Apr 6, 2009 5:59:20 GMT -5
You might have some water on your gas, i would clean the carb and go from there Oh and clean and reoil your K&N
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Post by varroa on Apr 6, 2009 19:49:00 GMT -5
thanks for answering! the gas is really fresh... the air filter was not used for about 9 months out of the year it's been on my ruckus, so it should be still good to go, i hope. but you don't think it's either lean or rich? it only bogs at that throttle range, 1/2 to 2/3s. meanwhile, i can get to about 45-47 on flats with stock drivetrain and a CDI.
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Post by chanito on Apr 7, 2009 6:06:30 GMT -5
Bogging is usually a lean problem, that is why i blamed it on water, if you have not touch your jetting i can not see a reason for it to be so bad all of a sudden, unless the weather had change dramatically
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Post by BeerAday on May 9, 2009 11:53:52 GMT -5
Wondering is it possible to hook up the hoses incorrectly so that you run some sort of reverse vacuum?? I am asking because my ruckus starts up with no problems. I put the intake on, and swaped the main jet, first to an 85, and then 88. I did not change the slow jet and just ordered a 35 this morning so that may fix my problem, and I will post if It does. I am running an aftermarket exhaust as well. It sat for about six months so I changed the gas and cleaned the carb. Here is what is going on....Starts no problem and sounds good. I just don't have any power. No low end what so ever. I can not break 20 mph if that. Is it possible to have the hoses hooked up wrong so that they have a reverse vacuum? Will the slow jet fix the problem in you opinion? Would you like to see pics because I can do that if it will help anyone else out there. Thanks
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Post by mcgilli on Jun 4, 2010 1:00:06 GMT -5
I just wanted to post this in case someone finds it useful.
After swapping out the original jet to a 88 - the Ruckus would start and idle fine, but when I started to give it gas very soon it would just die.
Now - I know right away people will say jet too small, jet too big - because that is what the local scooter shop kept saying, but that was not the problem. I know because I tried 88/90/92 jets and had the exact same issue.
The problem was that after I performed this the first time, I had run my gas line up and around while turning the carb over, it got kind twisted a bit and I didn't notice. So basically, there was only a tiny bit of gas even getting to the carb with this twisted line. Enough for it to idle, or even get to 5kmh but anymore than that and there wasn't enough gas keeping up with the demand.
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Post by I heart my ruck on Aug 3, 2013 5:15:57 GMT -5
Awesome write up super helpful never touched and engine in my life and got this done in 30 mins your the man Timber
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Post by MojoMonkey on Dec 27, 2013 3:30:10 GMT -5
Great write up man! Important to note stock small jet size is 35 not 38! But great guide!
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Post by Daveruxpin on Aug 14, 2016 16:07:39 GMT -5
Wondering is it possible to hook up the hoses incorrectly so that you run some sort of reverse vacuum?? I am asking because my ruckus starts up with no problems. I put the intake on, and swaped the main jet, first to an 85, and then 88. I did not change the slow jet and just ordered a 35 this morning so that may fix my problem, and I will post if It does. I am running an aftermarket exhaust as well. It sat for about six months so I changed the gas and cleaned the carb. Here is what is going on....Starts no problem and sounds good. I just don't have any power. No low end what so ever. I can not break 20 mph if that. Is it possible to have the hoses hooked up wrong so that they have a reverse vacuum? Will the slow jet fix the problem in you opinion? Would you like to see pics because I can do that if it will help anyone else out there. Thanks
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Post by daveruxpin on Aug 14, 2016 16:25:17 GMT -5
I followed these instructions to clean my carb to fix startup/idle issue. now it starts and idles just fine, but I can't get it above 10-15mph. Did I do something wrong with the reassembly? please help...
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Post by chanito on Aug 14, 2016 18:07:52 GMT -5
You .will need to make sure the throttle in the carb opens all the way when you turn the accel handle
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