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What have you done to your XS today?
- Thread starter I am Carbon
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Wonderful creativity.
New idle valve and all is well. Idle goes up to 1400rpm cold and comes down to 1100 when warmed up. The new o2 sensor is reading properly and AFR is good at idle. Running 11* timing at idle and all in is 35* which could probably be bumped to 40* to match stock.
Do you have provisions to monitor vacuum, TPS, or load?
http://www.xs650.com/threads/ignition-timing-and-vacuum-advance.46143/
I'm running everything on alphaN tuning right now. It bases advance and fuel on throttle position, air temp, engine temp and rpm.
Unfortunately with the throttle bodies the manifold pressure sensor normally sees around 70kpa at idle and that goes to atmospheric pressure right off idle.
There is a wideband that helps adjust the AFR, and with the laptop hooked up I can record everything. Once I get some more miles on it with more data logs I can switch it to ITB mode so that at high vacuum/low load it can run off the MAP sensor and run alphaN on high load.
Unfortunately with the throttle bodies the manifold pressure sensor normally sees around 70kpa at idle and that goes to atmospheric pressure right off idle.
There is a wideband that helps adjust the AFR, and with the laptop hooked up I can record everything. Once I get some more miles on it with more data logs I can switch it to ITB mode so that at high vacuum/low load it can run off the MAP sensor and run alphaN on high load.
Drip Dry
What good's a post without a pic and title, eh?
Just got back from a quick trip into town to top up the gas for tomorrow and the rain cloud I thought I could out run actually snuck around and came in from the west. Only 2 or 3 minutes in the rain, but that's enough.
A little damp rub down and a squirt of chain lube and all set for the morning.
What is significant about this tale, however, is the gas mileage I got on the Sarnia ride leading MaxPete the wrong way home!
My 76 has 78 carbs on it and it took 7.815 litres to cover 111.6 miles. I converted that to US gallons and my arithmetic works it out to 64.88 miles per gallon. Now the original fill was on the centre stand and the last was on the side stand, but even so, that is surprising economy.
That is Amazing fuel mileage!
Did a 75km boot in the outskirts of town last week and calculated mileage and was a little over 56 mpg and thought it was pretty good. 
I seem to consistently get 50-55 MPG, unless I’m hoofing it on superslab and fuel consumption seems to rise markedly.
I was converting to US gallons, so miles per Imperial gallon will be different.
A bit of rain today, so no riding, boating or fishing. So I took the opportunity for an oil and filter change, semi synth 10-40 motorcycle oil, and Heiden Tuning Honda oil filter setup. And while the engine was drained, I pulled the primary cover, removed the tacho drive gear, and replaced it with an alloy blanking plug, also from Heiden.(Yes, I removed that tiny thrust washer at the bottom of the gear 
)
And of course I put the parts on the digital kitchen scale, lost a whopping 94 grams/ 3.5 oz. I guess replacing the other tacho gear with an alloy spacer would save a few more grams....Yes, I am just a little obsessed with making the XS lighter whenever possible....
)And of course I put the parts on the digital kitchen scale, lost a whopping 94 grams/ 3.5 oz. I guess replacing the other tacho gear with an alloy spacer would save a few more grams....Yes, I am just a little obsessed with making the XS lighter whenever possible....
Sorry to tell you this but lighter oil doesn’t save any grams there .,
Well, I actually chucked the oil filter cover and machined off the "cooling fins" , which always looked a bit out of place to me, as shown in the first pic.. Should amount to around 90 grams/ 3oz as wellSorry to tell you this but lighter oil doesn’t save any grams there .,
A few years after I bought mine, Heiden started offering a version without those fins, which I would have got if available back in 2010, as shown in the second pic..
And seriously, I don't think 10-40 is too thin where I live, just below the 70th parallel. A normal summer day is between 5 C and 20 C, and stop-and-go traffic is nearly non-existent. And I really enjoy lanesplitting when traffic is slow
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A bit of threaded rod with washers and nuts seems to hold the motor steadier than the plain bolt (unless you have cut spacers to have like effect.)
And while the engine was drained, I pulled the primary cover, removed the tacho drive gear, and replaced it with an alloy blanking plug, also from Heiden.(Yes, I removed that tiny thrust washer at the bottom of the gear
And of course I put the parts on the digital kitchen scale, lost a whopping 94 grams/ 3.5 oz. I guess replacing the other tacho gear with an alloy spacer would save a few more grams
I think having a Tach to help diagnose an oil pump failure is preferred over a 3.5oz weight saving.............lots of other places to save on weight..........
Agreed - I’ve never been comfy without a tach.
Don’t have a big lunch and save the same weight....
Don’t have a big lunch and save the same weight....
Well, I did not just remove the oem tach. I basically replaced the entire instrument cluster with a pair of Daytona Velona analog electronic gauges, so the speedo drive and cables are gone too. I guess that saved around 1 kg altogether. And I do not really worry too much about the oil pump suddenly stopping, that must be a really rare occurence. If anything, an oil pressure gauge, or warning light would be much better for monitoring any lubrication issues anyway. And is something I may look into at some point. I do understand that the XS has really low oil pressure.
