0-60/100

[petejw]

i was going to say id be worried about valve bounce,
which planedick talked about, the other thing would be the worry
of the shim dislodging from the valve bucket, but yamaha recommended
changing the buckets/shims so the shims fit under them in instead of on top
for there race bikes but not sure what they revved out too.

[planedick]

Forgot

Maybe I never mentioned it, but I have a complete low mileage engine/tranny here in the garage, and at my age I'm pretty sure this bike is gonna outlast me for sure. The engine in the bike has at least 112,000 miles on it with nothing more than valve adjusting. Compression is 150 straight accross and you will be hard pressed to find one that runs better. It has the 750 final, and 60 mph in first is easy and quick.The excelleration between 3,500 and 8,000 is radical and it's still pulling hard at 10,000. The only thing I worry about is the valve springs pulling the valve closed before the piston comes up and hits it. Usually what happens at those rpm's is the keepers come off and drops a valve which destroys the engine.

[cywelchjr]

Here's my concern about the running the engine to 10k to achieve this. I know these engines are stout, but remember, that bearings are becoming pretty much NLA at any price and rings are available ONLY in oversize and pistons are not, and while there IS a big bore kit, I understand they are running their LAST run of those, so parts are getting scarce, which means in the future, custom made parts (I believe there are places that will make almost any part to spec, but they can be REALLY costly), as this is how some of the restorers of really old stuff do it, and it's why it can be so costly, fabricating a full set of custom bearings, and a full set of custom pistons and having a full set of custom rings made (although I understand there are rings that would work if only the grooves were a tiny bit deeper which if you made custom pistons you could do). Engines are still around but they are going to get harder and harder to get in good condition.

This makes me nervous about abusing the engine too much, I consider redline a safe place, the engineers clearly felt it was a safe place to be able to run the engine up to, and I'm thinking even sustained runs up to there are ok as long as everything else is in good condition. But 10k? that's 1500 RPM over redline. Maybe that's not a lot, but it could be the difference between and engine that does 200k and one that does 60k.

[natemoen]

Maybe with a younger engine or one that I knew what the condition of all the internals was, but on a 30 year old engine that I don't know how it was treated before I got it 2 years ago? I'm not comfortable pushing it to redline regularly even, I don't have that level of confidence in the condition of the lower end of the engine, and I'm not sure that the later engines are capable stock of hitting those RPM's like the earlier engines are, they don't have the same compression or the same cam profile. But I'm not sure based on the results that you could hit 60 in 1st with the stock FD even by 10,000 RPM, although since I don't have the stock FD and won't push mine that hard even if I did, there's no way for me to test that. Anybody with a stock FD willing to push to 10k and see if the make 60 in 1st?

When I get my painting done (gotta cut and buff and its done) and the engine broken in I will give it a try for you Cy!

[cywelchjr]

I've been WWAAAAAYYYY over redline many times. 10,000 is easy and it's still pullin' hard....

Maybe with a younger engine or one that I knew what the condition of all the internals was, but on a 30 year old engine that I don't know how it was treated before I got it 2 years ago? I'm not comfortable pushing it to redline regularly even, I don't have that level of confidence in the condition of the lower end of the engine, and I'm not sure that the later engines are capable stock of hitting those RPM's like the earlier engines are, they don't have the same compression or the same cam profile. But I'm not sure based on the results that you could hit 60 in 1st with the stock FD even by 10,000 RPM, although since I don't have the stock FD and won't push mine that hard even if I did, there's no way for me to test that. Anybody with a stock FD willing to push to 10k and see if the make 60 in 1st?

[petejw]

I've been WWAAAAAYYYY over redline many times. 10,000 is easy and it's still pullin' hard....

ive done that a few times as well
tho its usually after hitting a false neutral between 2nd and 3rd.

[planedick]

Red line?

I've been WWAAAAAYYYY over redline many times. 10,000 is easy and it's still pullin' hard....

[forexbob]

Empirical evidence

Well done Cy,
Can't argue with that. Thanks for the test

Bob

[cywelchjr]

Ok, test run on the way home today. Have a clear straight run that's good for it. Redline in 1st gear reads about 55, allowing for error, it might possibly be 60, but last check with GPS showed my speedometer almost exact at just about everything up to 80 MPH, so I doubt there would be anything more than maybe a bit of lag there. If I can't get PAST 60 in first with the 750 FD on a standard with as close to the right size rear tire as I can find (it's still slightly shorter than the OEM tire, but AFAIK you can't get anything that quite that size anymore) even with the OEM rear tire I can't see a stock FD doing in back in the day, and for SURE not now, and forget doing so with a special, even with a 750 FD unless you swap in a 17" rear wheel with it. I'll have to say, this is the first time I've really gotten on it with the 750 FD, and it was still quite a thrill, just not quite as quickly a thrill off the line.

[cywelchjr]

I'd say whatever redline is in 1st, which for me is higher than someone with the stock FD since I have the 750 FD, so I may well be able to hit 60 in 1st while someone with a stock FD might not (not remembering what speed I was going at redline in 1st with the stock FD, I've done it, but I wasn't paying much attention to the speedometer, it was all on the road and getting the front wheel back down (whoa brutus!) ok, so the front wheel was back down well before then, but that WAS one of the times it came up ). Being that 1st is pretty close to being second now, that would certainly put 60 in 1st in the realm for brutus now, so I may have to do a redline run just to see what the speed is at that point (just to prove a point, I VERY SELDOM, ALMOST NEVER go to redline, but I do go up in that area often enough to hopefully avoid getting a ridge up there). Thing is, I guessing I would be exceeding the speed limit anywhere around here if I hit redline in 1st gear, and I KNOW I would in 2nd . By third I'd be at "go to jail" speeds if I got caught, and yes, I've been up there on a test run or two, but only a couple, and only for a VERY short time (only this was with the stock FD, so "go to jail" speeds might be hit in 2nd now ).

[forexbob]

Hi Bob,
yes you are, (yes you are), yes it is and yes you do.

Fred, very well put (But I don't want to be that old)

18 years ago my bike could do 100 while pulling a tree stump with a keg of beer on the back, in 1st, at least that's how I remember it.

Lover, I don't believe you. How big was the keg?

...
buy a few more xs11s and keep trying you might get there eventually !

OK debauchery, you're on...as soon as I win a lottery

So, some think no and believe it to actually be silly to think that the bike could do 0-60 in first.
And some think that's it's possible and say thay have even done it themselves.

I'm going with my memory and the fact that I can do 0-50 in first no problem, I rebuilt the carbs, carbs haven't been sync'd yet, it's a 32 year old bike.....and I just like the idea.

So....what top speed can you get in 1st?

Bob

[TADracer]

you might reach 60mph in first but only once and thats if your lucky

Oh, I dunno....I kind of second planedick. 55-60 in 1st is easily obtainable in but a few short seconds, provided you have a good tune up and a good clutch with no slipping. My SF has done it before however I dont push it that hard in low gear very much. Not because of the bike slowing down but because of me slowing down. Besides, once you get it moving, the 'up to 60' part does not take all that much power. Its the 60-100 that takes double the effort and then the 100-top end that takes everything the motor has.

[planedick]

Easy

The one I have now will do that and more, usually right around 3 seconds. 2nd means 85 mph, 3rd over 100 but at that point I quit looking at the speedo and look to see what's comming at me that fast. Of course I have the 750 final in it and it's seen over 10,000 on the tach many times...

[debauchery]

keep trying!!

you might reach 60mph in first but only once and thats if your lucky
buy a few more xs11s and keep trying you might get there eventually !
and just think of all the spare parts!(not to mention the sudden spike in value to all our bikes!)

[xs11lover]

18 years ago my bike could do 100 while pulling a tree stump with a keg of beer on the back, in 1st, at least that's how I remember it.