eq
Junior Ruckster
Posts: 74
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Post by eq on Mar 30, 2007 22:38:37 GMT -5
This is interesting. So it sounds like there IS a link between the water temp and the SE valve, which I didn't think existed before... Before, as I mentioned above, I screwed the plastic housing out so the needle would be further away from being seated in the - gas hole - whatever. It does take time for the needle to move into the - gas hole - whatever (that just sounds sick, but better than 'orifice'). So... the further away from the hole, the longer it would take to be seated, and the longer I'd be getting an enriched mixture. But now, it's almost like it'd be better to have the needle as close as possible to being seated, but far enough away that it's letting in the proper amount of enrichment under 35C. The water hits 35C, sends current to SE valve, valve seats as quickly as possible.. If there's an issue with cold running, you'd deal with it somewhere else in the system, such as, in really cold temps, blocking part of the radiator... Anyway, I'll work with it some more when I get the time, and report anything intersting...
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Post by Dandy Dan on Apr 2, 2007 8:39:49 GMT -5
Interesting stuff...I'd rather spend my time on other mods but I admire your dedication to this idle issue.
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eq
Junior Ruckster
Posts: 74
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Post by eq on Apr 3, 2007 19:15:30 GMT -5
Yeah, so would I. But if I can't even get the scoot running right with the regular set up it's hard to move on to other things... I'm messing around with the idle mixture and idle speed at the moment, trying to make changes that help me understand the effects of what I'm doing. The main issues are idle too fast when cold, idle erratic when coming off of the SE circuit, idle too slow for about 5 minutes after coming off of the SE circuit... My 2002 was so flawless with all of this that it's hard to settle for anything less. The 2002 - always started on first blip of the button, no need to turn the throttle; idle smooth and steady when cold and hot; barely perceptible transition from cold to hot. Now I need to turn the throttle a little to start, plus the other issues mentioned above...
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eq
Junior Ruckster
Posts: 74
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Post by eq on Apr 4, 2007 23:02:40 GMT -5
Finally took a little time to pull off the se valve and re-adjust... Here's a few picts. This one shows the valve with the plastic housing screwed out almost all the way. The black cover is there for perspective. When inserted into the carb, the flange below the yellow line seats into the carb. When compared to the image below, you can see how screwing the housing in or out will make a difference in terms of how far the valve needle seats into the fuel port.   At the moment I screwed the housing in, not as far as this image shows, but farther than it was before. Haven't ridden enough to confirm any differences, though after I did it, while the scooter was still warm, the se valve wasn't actuated, whereas before, with the housing screwed out farther, it probably would have been... My feeling at this point is that you can adjust how much enrichment happens by screwing this housing in or out, and probably, this also affects how long it takes to do its thing once the engine starts to warm up. I'm wondering if maybe my temp sensor is off. Seems like all I need to alleviate my issues is for the sensor to wait longer before it sends its current to the valve... Here's all the parts of the valve...  |
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Post by Dandy Dan on Apr 5, 2007 10:14:18 GMT -5
Wow....nice pics. That's cool that you can adjust it like that.
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Post by chanito on Apr 8, 2007 20:26:39 GMT -5
;D Great info, i never thought about adjusting the SE valve with the body of the valve itself, but it appears that you can do it, obviously the further in (the more the cover is screw in), the needle is, the longer it will take for the SE valve to cut the fuel flow  By the way the brass two step cylinder with the stainless steel tip (in the middle of the pic) is your wax container, i was thinking that maybe grinding its tip a little would allow us to adjust, but your way is faster and easier |
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eq
Junior Ruckster
Posts: 74
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Post by eq on Apr 9, 2007 0:37:42 GMT -5
Yeah, it does seem to affect the duration of enrichment. But, I don't know, I'm thinking, or was thinking, that it also affects the amount, that the duration should be controlled by just one thing, the temp sensor, not 2. Why have 2 things?... My scoot seems to run better lately with the housing screwed in, the idle mixture a little richer than it was, and the idle speed a little faster. But I still can't seem to get that 5-15 minute period after starting cold to run well. It still idles (a little) too fast when cold and on the SE circuit, too slow for the next 10 minutes or so, then just about right thereafter (it will be more precise once I get my tach, and once I get my manual back it will be time to look into this temperature sensor/thermostat)...
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