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Post by Jasper on Aug 30, 2007 18:55:27 GMT -5
For my 2005 Ruckus, I used to have a yoshimura, 06 needle, stock airbox, stock jets, and stock setting for IMS. Engine runs nice and achieves top speed on straight roads of 65-70km/h
Now I have a Yoshimura, 06 needle, and a K&N filter (part no. 1613 or the one with the chrome hat) attached to the stock snorkel.
With stock jet, the engine idles nicely and revs nice on centerstand. When I ride it, it goes to 10km/h then wheezes and threatens to shutdown. I didn't test the engine any further.
Today I threw in a 80 Main Jet and here are the results:
Idles nice, revs nice on centerstand
Sometimes goes to 10km/h, sometimes 20, most of the time 30km/h then the engine coughs and sputters violently. (This is at near 50% throttle) If I continue to hold 50% throttle, the engine continues to cough harder.
However, when the road has a slight decline or when I tuck, and in combination with going full throttle, the engine responds differently. It gains power and picks up speed faster than with stock airbox. once past the "coughing" stage it storms to top speed below the warning light on the speedo
I also noted that the engine vibrated noticeably while picking up speed all the way from 40km/h to 70km/h.
What should my next step be?
Feel free to chime in with your opinions!
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Post by Jasper on Aug 31, 2007 3:13:21 GMT -5
2005 Needle installed:
LiteW8 saves the day, all sputtering and coughing are reduced 90%!
btw some more info of my environment, my elevation is 2372 ft and temperature now ranges from 20-30 degrees celsius.
more new changes noted to engine performance:
-Very loud
-During both full throttle and part throttle, there are still a few occasional hiccups. The Ruckus seems sluggish.
-top speed reduced to 50km/h-60km/h Requires tucking most of the time to reach 60kmh on flat
-Engine vibration gone
Should I try 78mj next?
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Post by Dandy Dan on Aug 31, 2007 8:31:23 GMT -5
The fundamental problem that you're dealing with when you toss the KN on is that it adds a lot more at at lower RPMs than it does higher ones because at higher RPMs everything is happening faster and there are other bottlenecks so you can hardly use the extra flow capabilities.
With your 80 MJ you likely had a very good mix for the top end but you had a hard time getting 'past the hump' between 10-40km/hr where there is a lot more airflow so your Ruckus leans out. What you need to do is get just enough gas that it doesn't lean out on the low end and hopefully that won't be so rich on the top end that you lose a lot of top speed.
I think that using a bigger slow jet is a good way to go because the SJ is always open so you get the extra shot off gas in full on the low end. If you don't want to dabble with slow jets than just go with the smallest MJ you can that doesn't cut out badly on the low end.
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Post by Jasper on Aug 31, 2007 16:54:25 GMT -5
Im planning to go 78MJ, and then richen up the IMS...what do you think? I still need to hook up a vacuum gauge and tach tho  |
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Post by Dandy Dan on Aug 31, 2007 18:21:30 GMT -5
The IMS is a very fine tune adjustment for your idle. It's basically to bridge the gap between slow jet sizes....so it could make your stock 35 slow jet flow from about 34-36 but if you need more gas than that then you need to go with a bigger slow jet. I think the IMS screw is going to be too fine of an adjustment to stop your leaning out but it might help if you're borderline.
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Post by Jasper on Sept 1, 2007 18:39:15 GMT -5
It might be borderline as you say,
Im still confused if it's going up or down on the MJ, so today I did something less difficult and got pretty good results.
After warming up the engine I turn the IMS screw CW in (lean) 1/4 of a turn and I got better acceleration up to 30-40ish km/h. The engine seemed more happy except some noticeable coughing is evident at mid throttle.
Went back and gave the IMS crew another 1/4 turn is (total 1/2) and I got even better acceleration again up to 30-40ish km/h but engine coughing has became even more noticeable during 1/2 to 3/4 throttle. During the sputtering If I don't give the engine gradual throttle, the coughing will cause a sudden drop in power. Nonetheless the coughing is not close to how bad it was with the 06 needle.
So Im predicting is my idle near-perfect, mid throttle too rich, and full throttle not rich enough?
Why I think full throttle is not rich enough is because with the chopped 06 needle having a thinner tip, my top speed was amazing, but with the 05 needle (having a thicker tip) I am constantly riding in 50km/h
What makes me confused is does coughing only happens when the engine is rich (as seen during part throttle with the 06 needle)? If so why is my engine coughing more while I lean up the IMS?
Also noted is my engine oil temperature being in the 70's today instead of 80's from yesterday. Very confusing
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