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Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
Clouds on Tres Cerros and
Mount Fitzroy, Argentinian Patagonia



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Old 29 Jun 2023
Grant Johnson's Avatar
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Quote:
Originally Posted by Qwazert View Post
What's the "Wack"?
Old time ChilliWACKers slang - not that I'm old time, though I do remember riding through in the '60's


Quote:
Originally Posted by Qwazert View Post
These carbs (there are two) are neither staged nor synch'd...they both operate on the same shaft. Neither the manual, nor any online resources I've found (and I've dug through many) make any mention of synchronizing the carbs. There are two intake valves and it appears that each carb feeds a valve.
Okay, good to know and no surprise with that setup. If there's no sign of any adjustment method, good enough. It's not like trying to synchronize two cylinders, which really does matter.
Note that some people have dumped the two carbs and gone to a single one! I wouldn't do it on a well running bike, but if the carbs are toast and the price is prohibitive to replace, it's a possible option.


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Originally Posted by Qwazert View Post
As far as I can tell, the coils are within spec and pass visual inspection in terms of cracks or arcing. But the spark plug boots are a known weak-link; the fact that one measured 4+ Megohms and could be brought to within spec with a light cleaning, attests to that.
And you've cranked it over with the plugs out and watched the spark? NOTE: Before you do that - some bikes - certain old BMW's IIRC - REALLY don't like that, electronics issues, so check if it's ok to do.


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Originally Posted by Qwazert View Post
I've thought about replacing the broken pilot jet, but I fear that I may ave damaged it during the extraction...I have it downstairs and will inspect it later...I only need to worry about the actual HOLE size, yes? It's a non-bleed type Mikuni jet as show here: https://mikunioz.com/shop/n151-067-p...v=13b249c5dfa9
With that type, YES. As long a it's in there just very slightly snug it will work fine - it may not stay there long term, but useful for testing. You could even just chop off all the damaged part and saw a new slot in what's left - taking care on inserting and removing not to damage the carb of course!.


Quote:
Originally Posted by Qwazert View Post
But this is the perplexing part because many other models out there can withstand an increase (or decrease) in pilot jet sizes, in order to aid cold-starting, or improve mileage without creating problems in overall running...but I suppose this model could be sensitive to changes. As I said: This is the ONLY change made from the stock setup...so it is plausible.
Plausible - and a starting point. I also strongly question the 3 1/2 turns out from fully in - very lightly - for the standard setting for the mixture screws - NORMAL is 1 1/2 to at most 2 turns out. I've NEVER heard of over 2. Doesn't mean it's not correct, but I question it.


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Originally Posted by Qwazert View Post
In its own way, it IS a fascinating issue but all things being equal, I'd sooner be riding...and considering that I sold a perfectly functional, reliable and solid bike to get this one, is particularly upsetting.
Bummer! And I get it - my fun bike is in the throes of a massive rewire right now so I'm spending way too much time in the garage and none on the road. Well I confess garage time is fun too, but not when the sun is shining and the temp is perfect!
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