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Yes I did do the mod to the sv. I was a little skeptical at first but it for sure shortend the twist and is a neat little mod and it did help with the shifting.
I guess maybe I just need to get used to riding a twin and its tendencies.... I have been riding in line 4s since I was 16. When I first started racing I did a track day with Keith code on a 636 and was routinely in the 1:27s and a best of 1:25 for lap times. When I bought an sv I did a best of 1:37 and in 2 years of racing, I am down to 1:27s. For whatever reason with the sv I find it to be more trouble braking and blipping and shifiting... very frustrating. On bill tanseys advice I will have to practice in a empty parking lot with the sv.....
AM#220
99 cbr 900 street
02 sv 650 race
I find it more difficult to find the right exit gear on my SV. Like you, I have always had I-4 bikes. I may mess with chaing the rear sprocket to one with one more tooth to see if that helps at all.
I don't think I ever got the bike into 6th on the front straight. I bounced off the rev limiter in 5th quite a few time. (no speedo on the bike, just a tach)
What are you running for gearing? Redline in 5th with stock gearing on an SV is moving along pretty good.
Fitz
fwiw, I'm at 15/46 and it's done me well so far.
It was a little tricky finding the PERFECT combo of up & downshifts at first, but as I got faster it started making more sense.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
I'm not sure how some of you perform(ed) your rev-matching but there is a way to rev-match without adding unwanted pressure to the brake lever.
LRRS EX #165 (formerly)
And you're bouncing off the limiter in 5th on the front straight?
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
Chuck's knocking on 16's!
Hm.... Me thinks you're geared shorter than 15/45. Maybe 16/45?
Go unbury it!![]()
Last edited by OreoGaborio; 01-02-10 at 05:35 PM.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
Ahh... yeah, I don't quite reach my limiter in 5th before my brake marker. Close but not quite.
You can either stick with that gearing & try to make it work, or shorten it up a tooth or two. I don't think a couple of teeth will make a whole lot of difference though, I think it's just a matter of learning your shift points.
I had trouble with my drive out of the bowl for the longest time... I tried forever to carry enough speed through to be up in the power band but it just wasn't working... so I'm grabbing one extra downshift than before and an upshift in front of the grandstands.
Last edited by OreoGaborio; 01-02-10 at 05:51 PM.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
Hahaha. Well it's a little tall, sure.
If it were me, I'm not sure I'd bother changing it out until it's at the end of it's life though. It could help force you to try & carry more cornerspeed through 6 and 12.
I say wait till it's toast then get a 46.
Last edited by OreoGaborio; 01-02-10 at 06:01 PM.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
I would not go out and throw the move away...just yet
it is a widely accepted practice in the dirt, on the street, and even racing - but with the advent of slipper clutches and lots and lots of experience...timing down shifts (taking them much later) all work.....
The key is not to have the back wheel break traction.....whatever works for you..
on two strokes this is not really an issue due to very little engine braking - e.g., in the dirt driving into a tight turn whipping though on the berm chopping the throttle does little to upset rear traction....try that on a big 4 stroke single.....
Graham
"If computers get too powerful, we can organize them into a committee — that will do them in"
LRRS/CCS Amateur #514 / RSP Racing / Woodcraft / MTAG Pirelli / Dyno Solutions / Tony's Track Days / Sport Bike Track Gear / 434racer / Brunetto T-Shirts / Knox / GMD Computrack
All this gearing talk makes me miss the TZ250, with the cassette gearbox.
I could slide out the whole transmission, change any particular gear ratio, and put it back in. This lets you really fine tune for a particular track.
Changing the sprockets affects all gears - sometimes making one corner better and another worse.
You almost can't avoid some amount of engine braking. The question becomes, how much engine braking do you desire? Blipping the throttle OR waiting to release the clutch until you are closer to your entry speed (and with lower RPM) will result in less engine braking force to the rear wheel.
Using too much engine braking can be tough on the machine and does not contribute to lower lap times, but engine braking does stabilize the motorcycle by keeping ("pulling") the rear wheel in line with the front wheel.
And, if you are used to having engine braking do a significant portion of your slowing, then a false neutral when slowing for a fast turn will certainly get your attention. Even if you don't think you rely on engine braking at all, it will be proven that you do to some extent with a false neutral.
Does anyone know if a turn can generally still be comitted to during a false-neutral situation?
Wirelessly posted (Samsung Lube.... Er, Glyde: Mozilla/5.0 440x240 Samsung SCH-U940 NetFront/3.4)
Well i've done it... Sorta. I was slow through the turn & ran it wide kinda cuz the chassis wasn't as stable as I would have liked and couldn't get back on the gas till I got it back in gear of course, but I salvaged the corner as much as I could.
Last edited by OreoGaborio; 01-04-10 at 02:27 PM.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
Sure. But, it will require that you make up some of the lost braking force with "actual" braking force (squeeze the brakes harder). The problem is that a full second or so will have lapsed before you realize and can react to the false neutral.
The other problem is that you will have to combat your muscle memory, which is "locked" into being comfortable with a certain amount of brake pressure. A false neutral will require you to squeeze harder than usual, which often results in braking less than you need to.
Also, the margin for error is now narrower, since you have to slow the bike in a shorter amount of time and space before turn-in.
You should be able to throw the bike into the turn after slowing as much as you can. Chances are your bike will be able to handle it.
The next question is "can the rider handle a faster than usual corner speed?"![]()