Triumphrat

iguana · 10-27-2006

I've has some pretty big and powerful bikes in my time,(see list) but none of them have sucked the juice like this little bike.

Had a chance to run a tank at pure, no-stop highway riding yesterday. Averaged 120 - 140 kph (74 - 86mph) and a couple of forays up to the ton.

Got 30.7 mpg !!!!!

Went to a place called Lancelin , as shade over 100k's from the fringe of the city. Filled up at the outskirts and was worried about not making it back. When reserve kicked-in at 169 kms (105 miles) I had serious concerns. Anyone who has experienced the wide-open of australia would know that one would have to plan fuel stops VERY carefully on a bonnie with this economy.

Just for context:

'06 T100
aftermarket reverse cones, 120 mains, 19T sprocket, AI removed, low 90's octane fuel. 4500k's on the clock.

From what I have read on past posts I am getting worse results than a Big bore 904 with airbox removed etc...

Back to dealers to see where all this extra fuel is going. The bike runs so well, that I can't imagine there's anything wrong with the carburation. ??

I've heard that Staintunes don't need re-jetting so maybe I should try a set of them and see if they preserve the bonnies stock fuel economy to at least a reasonable degree.

[ This message was edited by: iguana on 2006-10-27 00:19 ]

Binnsy · 10-27-2006

I get 220kms easy before I hit reserve on my Speedy. I have the 17 tooth sprocket and don't mind twisting the throttle thingy. Not sure if this is a sensible comparison as my bike is a bit heavier and may have a different tank capacity??

Sounds like you are running very rich or losing a bit somewhere?

MES · 10-27-2006

something ain't right somewhere because that is very low.
I can 145 miles without hitting reserve ( 1/2 hiway 1/2 twisties).

kliff · 10-27-2006

The 19T sproket might have it geared just a little too high. If the engine is straining in the least, it will suck up some fuel. I'd try the 18T......yeah, it's gonna turn more RPM's, but if it isn't pulling as hard it will actually use less fuel.
Did you experiment with main jets? Or just put the 120's in and go. 118's may work just as well....and if the air box, snorkle and filter are all still original, maybe even 115's ....

uber · 10-27-2006

Mmm - this is something I've been pondering recently too. I have a 12 mile ride in London every day, and the most I've got out of my Speedie's tank is a measly 95 miles before I hit the reserve. That's WAY below anything you guys are talking about. Surely riding around town can't make that much difference? :???:

SCCTrim · 10-27-2006

My mileage variant from city to highway driving is huge.

Something has got to be outta wack for you to be getting such poor mileage.

richb · 10-27-2006

Quote:

On 2006-10-27 04:45, uber wrote:
Mmm - this is something I've been pondering recently too. I have a 12 mile ride in London every day, and the most I've got out of my Speedie's tank is a measly 95 miles before I hit the reserve. That's WAY below anything you guys are talking about. Surely riding around town can't make that much difference? :???:

I have a 20 mile commute through London and get between 95 and 105 before reserve. I used to get below 100, but now I'm going faster, seriously, I get better mpg. Go figure. Something to do with fuel efficiency at higher revs, maybe? Also, someone pointed out to me that that's actually not bad mileage. Forget the fuel tank capacity, it's the amount of fuel you put in that matters. If I do 100 miles and then fill up, I put in about 9.5 litres, I know because it's always slightly less than a tenner. That's just over two gallons, so I'm getting mid-to high- 40's mpg, which is comparable to what these other guys are getting.

Silverado57 · 10-27-2006

My Speedmaster goes 130+ miles before reserve. This is with mixed stop & go and highway riding and often with 2-up riding.

I make sure the tank is REAL full when I stop for fuel.

markbvt · 10-27-2006

Definitely something strange going on. I get 45-50mpg on a longer, sustained ride like the one you described (around 50 if I'm sticking to 70-80mph; a little less if I'm riding faster).

--mark

Geoff · 10-27-2006

check how much fuel you actually use between fill ups, against the mileage on the trip meter. if you really get only 30 mpg, there may be a problem. real world mpg figures on these bikes is usually 35-38 at the worst, and 45-50 at best.
G