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Post by Jasper on May 14, 2007 19:37:34 GMT -5
"after warming the engine lower the idle to about 1700 rpms and then start turning the mixture screw 1/8 of a turn and blip the throttle stop when you reach the fastest idle"
After finding the fastest idle, what does blipping the throttle stop mean and what is the purpose of doing that?
"So far the best way to set up the mixture, get yourself a tach and a vacuum gauge, hook up the tach and attach the vacuum gauge to the little vacuum port for the PAIR valve, just set your mixture to obtain the highest (most) vacuum, check your idle speed and keep adjusting the speed so it remains at 200 rpms (failing to do this might make the vacuum read higher due to more speed instead of better mixture). Wow! it was by far the quickest and best SO FAR. "
Is the vacuum port for the PAIR valve the hole at the top of the cam cover or at the bottom of the cam cover? Does this method work if I run with a filter just clamped onto the carburetor and all hoses deleted?
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Post by chanito on May 15, 2007 18:41:15 GMT -5
OK to answer question one.- the idea of blipping the throttle is that sometimes the piston/diaphragm gets stuck on a weird position and then when you go to ride the scooter, it settles down and the idle mixture is out of adjustment, by blipping the throttle we make sure the piston moves and then goes to its rest position and everything is hunky dory So after doing any adjustment blip the throttle and make sure everything stays OK, if not then go back and adjust some more The engines on the ruckus pre '06 have a vacuum switched PAIR valve and the source of this vacuum is a little fitting on the intake manifold,facing the variator side, located between the carburetor and the head (it is actually part of the head, just located on the intake track) the better an engine run the most vacuum it produces, so by installing a vacuum gauge and making sure you reach the highest vacuum you also know the mixture is at its very best ;D Sadly for '06 and later they do not have that vacuum port and that means doing the mixture adjustment by the highest idle method, which is good just harder to do
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Post by Dandy Dan on May 16, 2007 9:20:19 GMT -5
This thread is a gold mine.
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Post by varroa on Dec 14, 2007 3:24:55 GMT -5
sorry for not being here often lately, guys but i am getting ready to ditch the stock airbox and dd is right, this thread is a DIAMOND mine! thanks for all the knowledge, chanito.
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Post by Dandy Dan on Dec 25, 2007 21:32:21 GMT -5
this thread is a DIAMOND mine! I stand corrected
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Post by pounder on May 21, 2008 19:20:22 GMT -5
I got a question for you chanito..I opened up my stock airbox with a b&s filter..added an 85 main jet and when I hit the throttle it hesitates, but does not stall out..just has a hard time working it's way up to speed..I blocked off the airbox inlet to see if I was running rich and this solved the problem..I also cut the spring (1-2 coils) and it helped also before blocking the airbox..question is..what jet should I go to next? 90? or 88?
also where do you get the shims for the needle?? is this a dealer thing?? many thanks!
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Post by chanito on May 22, 2008 18:47:37 GMT -5
I got a question for you chanito..I opened up my stock airbox with a b&s filter..added an 85 main jet and when I hit the throttle it hesitates, but does not stall out..just has a hard time working it's way up to speed..I blocked off the airbox inlet to see if I was running rich and this solved the problem..I also cut the spring (1-2 coils) and it helped also before blocking the airbox..question is..what jet should I go to next? 90? or 88? also where do you get the shims for the needle?? is this a dealer thing?? many thanks! First i would turn the idle mixture screw 1/4 of a turn counterclockwise and try again and 88 seems like a good size, that is what i am using on my big bore ruckus, but the stock likes it too once you put in an intake You can buy the shims at radio shack, they are small washers
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Post by pounder on May 22, 2008 19:47:23 GMT -5
thanks chanito..I adjusted the mixture screw quite a bit and kept running it to see if it had gotten better..it helped a bit when I was doing it, but no matter what it always hesitated the same or slightly less but still not close to running right..I ordered a 90 jet today because I couldn't wait any longer, so i'll pop it in and give it a shot..worst case I need an 88 or a 95..they're not too expensive so it's all good..i'll post back my results...
thanks again
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Post by pounder on May 27, 2008 20:50:22 GMT -5
well got my 90 in and it seems great..although I am still running the stock slow jet..it doesn't chug or anything off the line, but there does seem to be a loss of power down low...I don't know if I should get a larger slow jet or not..or try to drill it out a bit, but it's hard finding a drill bit small enough to open it a bit..
edit: maybe a shim would do it on the low end..does it go around the needle base before you insert it into the shaft? like a hoop toss?
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Post by nobodysdog on Sept 16, 2008 15:21:40 GMT -5
Great Great Thread!
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Post by Arnie Hernandez on Jun 26, 2009 20:23:42 GMT -5
Chanito, I have a question about jetting.
I installed a MRP exhaust and an air intake and my ruck didn't run. So I upped the slow jet to 38 i think, and the main jet to 88. I lost all of my top end. What normally was 37 was now 33-34. I increased the main jet to 90 and it behavd better but not back to full. As a trial I uppped the main jet to 105 and it ran better but there was some bogging in the mid band. Should I increase the main jet again, or should I start tweaking the idle screw?
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Post by chanito on Jun 28, 2009 9:13:12 GMT -5
ADJUST THE IDLE MIXTURE
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Post by BamBam on Jul 6, 2009 22:21:38 GMT -5
I need help shimming the needle. I am afraid to pull the needle from the Diaphragm for the first time, I dont want to break anything. Do I just get some needle nose players down there and pull it out?
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Post by BamBam on Jul 6, 2009 22:23:37 GMT -5
correction "pliers"
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Post by Afallenking101 on Sept 2, 2009 14:53:54 GMT -5
I found out that using a BIC round stick Pen tip works quite well for adjusting the Idle mixture screw but was wondering where i could buy a tach for my RUCKUS ANYONE?
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Post by Leo on Nov 25, 2009 23:56:54 GMT -5
Good information. I found that iyour Radio Shack antenna worked okay. However, if you take the jet out you can cut a slot across the top with a Dremel tool (or a similar device) you can use a standard screwdriver to make adjustments....
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Post by swingarm on Oct 3, 2010 3:36:13 GMT -5
On the instructions that you started this post with you said this, "..as a rule of thumb if it runs way better warm than cold your jet is too small and if it runs better when cold your jet is too small." If it runs better hot it's to small and if it runs better cold it's to small? Just wanted clarification.
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Post by chanito on Oct 3, 2010 8:12:56 GMT -5
On the instructions that you started this post with you said this, "..as a rule of thumb if it runs way better warm than cold your jet is too small and if it runs better when cold your jet is too small." If it runs better hot it's to small and if it runs better cold it's to small? Just wanted clarification. In the first statament i forgot to include the word "weather". So if it runs "way better" in warm weather than in cold weather your jet is too small, the other one is regarding just starting your scooter ride on a particular day, so if it runs better mainwhile the starter enrichment valve is open and worst when is closed and the engine is warm then your main jet is too small
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