Taboma

Your "kids" would never touch that relic of a calculator! You take me back to my college structures classes!! Do you keep old **** like that? Maybe you should mount it in your dash as a ultra cool GPS! I bet it will plug right into the 400R.....when you get them!

Nastybug

You're right Ron, Everybody is invited. We'll have to figure out a date. We can take turns going out for two man rides. It would be a fun weekend or its better here during the week. Have a pool and a couple yamaha wave runners. What do you think? Im pretty sure by the way that after discussing my set up situation with a few qualified people I will easily see 120mph when all is said and done over here in the salt and in discussing it with Dave Dewald. He's been working on some things for me for a few months now. Probably call him next week. I definitely gained something from the salt alone in my opinion although no top end comparable conditions like out at Merc. Im not messing around with Setback or lowers til next season so it will have to wait but we will see. Let me know about the visit thing. Lets put Sam and Ron in charge.

Taboma

I have not seen any dyno results for the 400R, but... I would like to make a reasonable comparison to two stroke racing dirt bikes to 4 stroke bikes - be it they are different displacements, but the results support the 400r's reported midrange power. I spent most of my life with a leg over motocross bikes and ridden both 2 and 4 stroke bikes and know their strengths and limitations intimately. Check out these graphs of dyno runs, back to back on the same dyno from a motorcycle magazine test. Amazing what a 4 stroke can produce over a very wide RPM band. A supercharged engine will just magnify the power band width.
[ATTACH=CONFIG]553338[/ATTACH][ATTACH=CONFIG]553339[/ATTACH]

Double Rigged

iTrader: (1)

David
I do not think the graphs are the same. One is for torque and the other for power?
If what you say is true and I do not doubt regarding the bikes a 300hp xs with out run a 300 verado any day of the week.

Taboma

Yes they are different. One is torque and one is HP,comparing a Yamaha YZ125 (blue line) to a Yamaha 250F ( Yellow line). A 125 - 2 stroke will keep up with a 250 -4 in good conditions. Add up hills, sand, etc. and the torque of the 4 will blast away! In a bike with gears, you shift less with the 4 because of the wide torque band, corner to corner and on starts. HP is HP and weight is weight as we all have been preaching! The midrange punch of the 400's should be stunning though! Top end not so much in my opinion. If they (400's) were lightweight, they would by on my 28 however. I think that is why the work so well on CC's. Back in 1997 when Doug Henry won the AMA outdoor MX title on a prototype 400 cc Yamaha four stroke against a field of 250 -2 strokes, it was approx. 250# bike with 40HP against 230#, 50 HP 2 -strokes. Ten years later the are 450cc, 230# and 50+ HP and reliable as hell! Maybe, with some R&D, the big boys will make a lightweight, high HP four. I know it can be done.