bore kits

[lee.knight]

where can you get a big bore kit for a honda cr 80

[John]

Don't know, but why on earth would you want one anyway?
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TT600 neeeeeeeeeeeeeeeeeeowwww!

[lee.knight]

nsr 125-110 mph baby

[Scotty]

110 mph.... yay...

hmm whats that rattle,

Boom, back wheel locks, sends you out on arse... nice
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Regards
Scott

[alt]

[Scotty]

Also going through run in period...
Although i need a batterty, then the power valve can be setup and then... i have athe run in period. joy...
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Regards
Scott

[alt]

I was bored this morning so decided to semi-strip the bike. Removed exhaust and carb to look for restrictors, but alas not to be found... Now I believe the speedo when it tells me how fast I'm going

[Scotty]

the CR80?
Should do about 50 -60 mph.?
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Regards
Scott

[cagiva gezzer]

stan stephens does big bores for CR80. A CR80 puts out 28ps, which is almost 28bhp, so it would prob be faster than a NSR125.
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"because one stroke isnt enough and four strokes waste two"

[Scotty]

I just used the 80, as 80cc, with an average state of tune, guessing it was a trails bike as such, unfaired, and came up with that speed. oh well whoops...
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Regards
Scott

[cagiva gezzer]

you are forgiven.
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"because one stroke isnt enough and four strokes waste two"

[Scooby]

A CR80 will be nowhere as fast as an NSR125. CR80's will top out at about 50-60mph at a guess, they are tuned and geared for acceleration.
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A big enough hammer fixes anything!

[mtthwpez]

Im getting a big bore kit that will take my cbr1000f from 998cc to 1089cc mmm ive got 135bhp i reckon it will have around 160bhp!!!.
instead of 170mph top speed it will goto 190mph prehaps
yeah baby

[carvell]

Why would you ever want to go 170mph anyway?
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Yamaha TDM 850

[Zimma]

[mtthwpez]

because i can! , just wait till i start talkin about nos and turbos

[McJamweasel]

[Scotty]

Surely another 100cc won't give that much of a boost of power on its own...?
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Regards
Scott

[mtthwpez]

ps and hp are different i dont know the exact workings out but its like saying kph is the same as mph!
it has the gearing to do 210mph but it doesnt have the power or torque to get it there.

[carvell]

Maybe he thinks that if you add another 100cc, that adds the top speed of a 100cc bike, about 50mph say, to his own bike, making it 50mph faster.
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Yamaha TDM 850

[Zimma]

Bah, just read a conversion for PS to HP....

horsepower (PS) to horsepower (HP) 0.9863
horsepower (HP) to horsepower (PS) 1.014

Hmmm, a difference of .xx not really worth worrying about if you ask me.

Out of interest, how old are you mtthwpez?
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-Zimma

[Zimma]

[mtthwpez]

23 and a dragbike fanatic (there you go)!

[Kickstart]

Hi

PS, HP, CV, etc are all basically horse power. PS is the German measure, CV is used in Italy and France, etc. They are not exactly the same but they are very close. The difference between them is going to be so small that you would get a bigger difference in numbers on successive dyno runs of the same engine.

Adding less than 10% to the capacity is not going to add much power. Given that it will not rev any higher and you will still have the same size valves along with the same cams you will probably only gain 5% power. The Probably take the CBR up towards around a true 125hp, with a true top speed around 160~170mph. It doesn't have the aerodynamics to go any faster without a serious amount of extra power. A Blackbird manages to make a true 129hp and that can only just get beyond a true 170mph as standard.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Zimma]