Warwickb


Group: Members
Posts: 1911
Joined: Sep. 2003 |
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Posted: Nov. 03 2008,15:40 |
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Perhaps the easiest way to check this stuff out to an extent would be to simply unhook the variable air jet solenoids electronically, which will leave them with just the 'always on' central jet in the solenoid unit block providing a consistent amount of air for the air bleed on both cyls? Logically that would prevent any additional or inconsistent 'leaning off' via the air-bleeder nozzles - thus indicating if the varaible bleed is actually presenting any kind of problem (I should have tried this myself really, but as I had no problems I didn't bother). You could even experiment with different amounts of air bleed by simply inserting different size jets in the air bleed hose from the carb if you wanted?
Personally I tend to think that 'a carb is a carb' pretty much really, and I don't think there's any reason at all why the Sugo ignition would cause problems with any carb really so long as it is jetted correctly for the application . The bigger carbs certainly seem better for ultimate power at the top end, but the little 28s work surprisingly well in my experience - as illustrated in the dyno runs above and elsewhere.
The Sugo CDI only operates the powerjet solenoids at the very top of the rev range - effectivley to lean off the mix at the top end to give more overrev. It can't affect carburation anywhere else in the range as far as I can tell . And I suspect it makes very little difference if the powerjets are plugged in electronically or not unless the set-up is absolutley bob-on - certainly below about 11.5k in any case.
The sugo loom is just a stripped-down loom with no privision for road gubbins really. There's no voodoo in it - It's just wires that conduct electricty. As long as the spark plugs and the powervalve servo are getting the info they need, I don't think the loom itself can make any real difference - unless I'm missing something fundamental here?
For what it's worth I don't currently run the powerjets connected (electronically) on my TZ carbs - unconnected, the PJs are 'always open', meaning that I don't get the leaning off right at the top. I may experiment with connecting them up at some point, but the bike makes ample power and revs for my needs. Once I've finished the winter rebuild I'll get it on the dyno and see how it's doing.
-------------- A garage overflowing with old stinkers...
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