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Old 06-17-2012, 03:33 AM   #13231
robmoto
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Hi James a loose or broken wire one that may only just be touching to make contact sometimes but is sort of held in place by the others at the bottom of the ignition switch is worth a look.
Side stand switch worth checking ,
And allso the pick coil and its location making sure it has not moved back.
cheers.
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Old 06-17-2012, 12:04 PM   #13232
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Dyno


Sunny out this morning for a change.


Went for a dyno run. Dynojet 250i


Shes rich.
Everythings stock bar the end can and header.
Do i mods to increase air flow or go down a jet?
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Old 06-17-2012, 12:28 PM   #13233
Ladder106
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Just an opinion

Dunno exactly how to interpret the graphs since MPH is used rather than RPM.

I'm assuming that the run was done in top gear so MPH and RPM are directly related.

Seems like the easiest thing to do would be to drop the needles one notch and retest. That way you'd still have the "insurance" of being a bit rich on the mains.


Seems odd that the pipe would make things richer. Do you have any wear in the needle and needle jet sets?
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Old 06-17-2012, 12:40 PM   #13234
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Originally Posted by Ladder106 View Post
Dunno exactly how to interpret the graphs since MPH is used rather than RPM.

I'm assuming that the run was done in top gear so MPH and RPM are directly related.

Seems like the easiest thing to do would be to drop the needles one notch and retest. That way you'd still have the "insurance" of being a bit rich on the mains.


Seems odd that the pipe would make things richer. Do you have any wear in the needle and needle jet sets?

Feck all wear anywhere on the carbs L. And yeah i was puzzled too why she would be rich with a header and can?
Dyno dude says go down a jet.
Would be nice if i could use that extra juice in conjunction with a less restrictive air filter arrangement. I really didnt want to mod things that much beacause as far as i can tell you just become a serial meddler who walks the land for eternity hunting stociometery like some fabled grail quest.
Suppose carb removal beckons to make sure main jet is stock, assumptions being what they are..

PS No rpm and torque as a coil pick up wasnt handy for him to piggyback.
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Old 06-17-2012, 01:57 PM   #13235
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The perfect air fuel mixture in the lab is a bit different from what you need in actual use. I've read that most engines like it better in real-world use if they are a bit rich.

Plus a bit extra in fuel cost is more than off-set by burned valves and head work.

Very modern engines with knock sensors and all that electrotrickery can likely get away with a much closer to "perfect" mixture since they can almost instantly adjust timing and mixture to keep bad things from happening.

With our older technology...getting pretty-damn-close should be considered perfect.

I still like bumping the needles one step leaner. It's quick and only required tank removal and a bit of bad language getting the screws off the top of the carbs. In theory, at least, that should adjust your graph to be leaner until the needles are completely out at full throttle where you still have the rich conditions on the mains.

Trying to get more air into the SR41 airbox seems like more fiddling than I want to to and then you're back to "who knows where" on the jetting.

Hows the bike do for mileage, mpg, l/km, or whatever units you use?
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Old 06-17-2012, 03:20 PM   #13236
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The graph represents a wot sixth gear run so the needles will be staying where they are id iamgine.
He did some part throttle runs at various rpms and shes in the green at roughly 12.5 to 13.5 but as you can see wide open (and im guessing on the main jet at that point?) shes rich, hence mister dynos rec of a smaller one.

Yeah, the persuit of the ideal suck squeeze bang burn is a rocky road. Recently went through the mill learning to use tuneboy to map the capo and its paid off.


Stocks about 85 and 58. Blue trace is tuneboy ignition advance and fuelling changes. Red trace is the coup de gras delivered compilments of a pc3 full custom tune.
Next is a map per cylinder and air box fiddlery which should nett about 105. Shes does about 45 mpg.

After this i then took her to France and Italy last month!
There now follows gratuitous non dr big photos


Lake Annecy, France


Chamonix


Courmayeur, Italy
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Old 06-18-2012, 04:06 AM   #13237
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Well, gentleman - I am happy owner of 2012 Triumph Tiger 800XC with some farkles. On photo screen and mirrors removed to fit into van.

Kinda "new leaf" in my motorcycling life....get on and go...

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Old 06-18-2012, 05:06 AM   #13238
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Sunny out this morning for a change.
Nice.
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Old 06-18-2012, 05:50 AM   #13239
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Nice.
Cheers buddy!

Blue, really dig the new purchase, is it warm? love the pattern!
Bike aint bad either
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Old 06-18-2012, 07:26 AM   #13240
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My BIG runs rich aswell ,the end of the can is always "sooty" and i have the same header and Lazer can ,you would have to think improving the Air flow would make the most of the extra fuel rather than strangling the engine with less fuel.
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Old 06-18-2012, 09:03 AM   #13241
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Gidday Colum nice pic,s of your trip and bike mate, do you know what the main jets are and needle C clip setting is.
And what octane rating fuel was you using .

Blue I think it will take a while before you loose that smile on your face, I wish I had one of those Triumphs, well done .
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Old 06-18-2012, 11:04 AM   #13242
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Yeah Spen it seems like the right thing to do alright seeing as the mpg is aok.
Rob, trip was class, lots of mountain passes with sights and roads i wont forget.
The needles wernt worn and were set to factory specs. I never noted the specs stamped on the main jet but im nearly positive its stock.
Anyone any pictars of some of the less invasive means of increasing air flow while still filtering air.
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Old 06-18-2012, 03:43 PM   #13243
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Cheers buddy!

Blue, really dig the new purchase, is it warm? love the pattern!
Bike aint bad either
Who's talking about fashion? That is Norwegian!
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Old 06-18-2012, 06:48 PM   #13244
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Colum this is what I did to the orange bike, but I allso put pumpers on it , If you increase the air flow to much you may upset the vacume to much and the CV bst 33 carbs may play up.
Just this little extra I think won,t hurt with the standard carbs but could just benafit you enogh to make it right and you can do it with the air box still in place with the filter removed then vacume up any plastic left in the box from cutting.
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Old 06-18-2012, 06:49 PM   #13245
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