75 mph or 120km/h

[CrazyChris]

Howzit guys. Searched for this but could not find anything. What revs are you guys at in top gear while traveling the above mentioned speed. Thanks in andvance

[CaNsA]

If I'm pinning it then usually about 14k.
If I'm just plodding about then when ever I need to.

The thing with the 400 is there are 3 parts to the rev range.
1500 > 4500 for pulling away from a stand still.
4500> 10k for normal riding and slight bursts of power
10k + for max power and acceleration.

[banner001]

use this chris...http://www.gearingcommander.com/

or if your bikes not on there, tell it your on a zxr 400 and just modify the gear ratios (if you know them), if not, assume its a 89-90 H model gearing...you wont be far off.

FYI my rear tyre measures 76.8" circumference, so i use that as it all matters, and i think our bikes are .53" chain pitch...

top gear/rpm is easy to work out for our bike as it should be 75mph = 7,500 rpm for stock 15/45 final gearing. (i.e. 90mph = 9,000 mph)

when i change my chain next ill go for 15/46 gearing, lose a small amount of top end, but get a small amount of acceleration and less chain wear.

[CrazyChris]

The only reason I'm asking is cause the mechanic said I shouldn't push it further than 6000rpm until the motor is fully settled and I hate doing less than 120km/h on the highway.

[banner001]

if you've replaced piston rings, or done any valve work then keep it under 6k for the first hundred miles, make sure you use all gears, and dont labour the engine, so dont keep it under 3k rpm for extended periods.

between 101-300 miles, keep it under 8k rpm, ride same as before, 301-600 miles keep it under 11k rpm, after 600 miles check valve clearances and you should be good to go from there as fast/high rpm as you want.

i would also suggest changing your oil after the first 100 miles and at 600 miles...your breaking in a "new" engine, the parts need to mate correctly or your long-term engine performance will suffer.

[CrazyChris]

He did valve worked and honed the cylinders lightly. He suggested taking it easy for 1000km or 625miles. Most of my commuting will be highway riding (86 km) and our speed limit is 120km/h. Slower than that and the cages will push you off the road if need be. Gonna be fun and games

[banner001]

my fzr will be the same, you just gotta take it gentle, use all the gears, dont labour the engine or over rev it. treat it very gently at first and it will break in properly.

one more thing, for the first 100 miles let the bike cool down for a good 15 minutes after every 1 hour continuous riding...yes breaking the engine in is a pain im gonna try to do my fzr 1000 engine over a long weekend, do 300 miles the first day, another 300 the following, and then another 300 to check everything over the following day before giving it beans on the last

[CrazyChris]

By cool down I assume totally switched off? Unlike a turbo engine that needs to idle a bit after being driven

[banner001]

aye, engine off and let it cool down, its not gonna hit ambient, but it gives it time to expand and contract properly.