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Discussion Starter #1
i have an 04 625 smc and my mileage is outright shitty. ill go litterally 50-60 miles and the engine quits and i have to turn on the reserve and fill up. could soemthing be wrong i dont ride the damn thing hard i dont know whats going on. whats interesting is tonight it sputtered and died. i flipped to reserve and it started up again. then when i was riding i switched it back to the main and it got me home about a mile or 2 no sputtering at all. I just got it 3 days ago. it has a full doma exhaust and apparently was rejetted by the previous owner. on the freeway pacing my friends r1 doing 80 im indicating 74. Im not sure whats going on. if someone could help id appreciate it.

Any ideas?
Thanks,
Tom

Any ideas?
 

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did either of you have a gps to compare? my r1 speedo is off (too high) by about 10%. when i compared my ktm with gps, it was pretty accurate.

as for mileage, you should check the jetting. the PO had a 198 on mine before i rejetted.. i think i get about 70-75 before it hits the reserve.
 

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Discussion Starter #5
None of us have gps. I'm pretty sure his bike is spot on. I sold my r1 last week and got this and our bikes used to indicate pretty much the same while pacing each other.

Ill check the gearing and see what I have when I get home. Is there a thread describing how to rejet these bikes and tune the carbs. I’ve played with Holley 4 barrel carbs on my old mustang but I don’t think I would even know where to start on a mikuni if that’s what it is. Also where would you go to get the main jets? So I’m definitely a bit short on mileage but I had always heard these thing getting 50 miles to the gallon easy. Is that an exaggeration?

Thanks,

Tom
 

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None of us have gps. I'm pretty sure his bike is spot on. I sold my r1 last week and got this and our bikes used to indicate pretty much the same while pacing each other.

Ill check the gearing and see what I have when I get home. Is there a thread describing how to rejet these bikes and tune the carbs. I’ve played with Holley 4 barrel carbs on my old mustang but I don’t think I would even know where to start on a mikuni if that’s what it is. Also where would you go to get the main jets? So I’m definitely a bit short on mileage but I had always heard these thing getting 50 miles to the gallon easy. Is that an exaggeration?

Thanks,

Tom

Most everyone reports from 37mpg (me, and I'm running a 17/42, stock on most is 17/40. yours, a 04 seems to of had several gear sets stock) to like 41mpg... I wish I got 50mpg out of mine and still kept the same power!
 

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i have an 04 625 smc and my mileage is outright shitty. ill go litterally 50-60 miles and the engine quits and i have to turn on the reserve and fill up. could soemthing be wrong i dont ride the damn thing hard i dont know whats going on. whats interesting is tonight it sputtered and died. i flipped to reserve and it started up again. then when i was riding i switched it back to the main and it got me home about a mile or 2 no sputtering at all. I just got it 3 days ago. it has a full doma exhaust and apparently was rejetted by the previous owner. on the freeway pacing my friends r1 doing 80 im indicating 74. Im not sure whats going on. if someone could help id appreciate it.

Any ideas?
Thanks,
Tom

Any ideas?
I have an 04 with a Big Gun race pipe carb rejetted and I was running a 15/42 gearing and I was getting the mileage you are talking about. I dropped to 16/38 and the mileage got better, no 50 mpg but better.
 

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Discussion Starter #8
rfear sprocket is 38 i havent had a chance to pullt he cover and look at the front yet though.
 
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