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September 22, 2014, 06:25:36 PM

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1
According to my experiments, the ECU doesn't use the TPS signal at idle anyway, so having it set at 0.76V won't affect the idle mixture.  I've tried varying mine while watching the mixture, and nothing at all happens until it gets up to about 1.2V (if I recall correctly) and then the engine suddenly stops.

At idle the ECU uses the O2 sensor on its own to set the idle mixture.

At least, according to my experiments......


    Steve, I wouldn't but much faith in tuning or trying to determine an accurate idea of what the AFR's are by using a narrow band o2 sensor.   All it is going to tell you if it is Stoic, too rich, or too lean.   And switch in between.  My experiment's show that TPS voltage WILL richen across the range ... including idle.   By plug reads and a sniffer on a Dyno.


http://www.enginebasics.com/EFI%20Tuning/AF%20Ratio%20Basics.html
2
Bullet Electra & AVL Models / Re: Crunch Bang (Insert Expletive Here)
« Last post by Adrian II on Today at 06:07:27 PM »
Let's see:

something to lock the clutch, alternator rotor extractor, clutch centre extractor (possibly not needed) impact driver with hex bit for the countersunk screws holding the inner primary cover, 32mm ring spanner for the AVL engine sprocket nut, clutch locking tool, plus the usual selection of spanners and hex/Allen keys, big drill bit if you can only get the right-foot shift inner cover and you still have the left foot shift, 8mm (or 5/16") taps with tapping size drill for relocating the inner cover mounting holes in the drive side crankcase. Can't think of anything else just yet. All that is actually quite a quick job, as I may have a total strip down to do I'd need one or two extras.

Have I forgotten anything, guys?

A.

PS: it was 9+ years but less than 17,000 miles!
3
Continental GT Cafe Racer / Re: GT Stage 1 Performance Kit results
« Last post by JohnDL on Today at 06:04:39 PM »
The UK Royal Enfield importer has told me the RE Sports exhaust can be fitted without affecting the warranty as its a genuine RE accessory.

It's stamped "Not for Road Use" though!

John
4
Bullet with the UCE engine / Re: More on loud pipes
« Last post by Ducati Scotty on Today at 05:44:07 PM »
Perhaps, but a loud (very loud) pipe does help - I use it regularly and blib the throttle if I see ignorant motorist - it works...

Blipping the throttle, no matter how loud, relies on the other person noticing that and reacting in the way you hope, which is never guaranteed.  Using the brakes and handlebars only requires me and takes the other person out of the equation.  I think the cat/rocking chair analogy is a better model.

Scott
5
Tech Tips / Comparison of Inexpensive Digital Multimeters
« Last post by singhg5 on Today at 05:22:51 PM »
Tested four digital volt/ohm meters for their performance - did voltage test on batteries, background resistance, resistor test, diode forward voltage test, calibration with potentiometer and checked for stability and reproducibility.

These were under or about $20 dollar. The best one came out to be Innova from Autozone.

Cheapest CenTech from Harbor Freight was acceptable in some tests and can be calibrated for voltage test (need a reference to match) but had unacceptably high background resistance control ohm values. HF has given me a few of them FREE. But they are less reliable in some ways.

https://www.youtube.com/watch?v=KlInJbI4iwo
6
Vintage Royal Enfield/Indian / Re: Twin Top End Questions
« Last post by ace.cafe on Today at 05:19:15 PM »
The spigot we're talking about goes around the cylinder not the 2 locators that are sticking out of the cylinder. If I'm understanding what you are saying. The pictures don't show any cylinder spigots that I can see.  ERC
Yes, it is important that we are all talking about the same thing.
I don't see any tall spigots on those cylinders, so he may be talking about the locators.
In any event, we can get it figured out, once we are all on the same page.
7
Vintage Royal Enfield/Indian / Re: Twin Top End Questions
« Last post by ERC on Today at 05:16:00 PM »
The spigot we're talking about goes around the cylinder not the 2 locators that are sticking out of the cylinder. If I'm understanding what you are saying. The pictures don't show any cylinder spigots that I can see.  ERC
8
Please note that it is for the 28mm Mikarb.
A 32mm carb needs more size in the inlet/outlet passages.

I'm sure that it could be modded for the 32mm. If he plans on doing the type of adventure riding he has been doing this probably is the way to go. Retaining the airbox protects the filter and keeps the bike looking original. Cleaning the filter is now simple and will last practically forever.
9
Campfire Talk / Re: A first... for me.
« Last post by boggy on Today at 04:25:37 PM »
There was a thread in this forum a couple of years ago about this very problem called SMIDSY, "Sorry Mate, I didn't see you", or something very close to that, about a solution to this problem. www.youtube.com/watch?v=eqQBubilSXU
It's really not the people in the cages are out to kill you...usually!...they just don't know you're there.

+1 to that video, it's great, and also +1 to not putting the whole problem on car drivers.  Drivers are never going to get better about motorcycles, so it's up to us to adjust.  Getting pissed at car drivers will do nothing to keep your rubber side down.  If someone almost kills you, the only thing you can actually do to salvage the situation is to learn from it, and let it go. 

Riding upset is hazardous to your health.
10
Something I dug up. There is all kinds of info on the K&N mod.

http://www.enfieldmotorcycles.com/forum/index.php?topic=1195.0

Please note that it is for the 28mm Mikarb.
A 32mm carb needs more size in the inlet/outlet passages.
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