New wheel Bearing

[nsr_J22_FOXEYE]

So as some of you may know I am refurbishing my beautiful NSR J22 Foxeye (name drop ) ... To the point I am curious if it is worth me replacing my wheel bearing's ... there doesn't seem to be anything wrong with my old ones, but I do want her running in good order for spring as she was last year. I'm not sure when they were last replaced but I have done 5k miles since I bought her (17k on clock) ??? ideas and comments?
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Never Ride Faster Than Your Angel Can Fly

[.....]

If they're OK leave them I reckon. Get the wheels off the ground and give them a good shake from side to side, any sideways play then change them.

But then again, it's a quick and reasonably cheap job so might as well for peace of mind.

[nsr_J22_FOXEYE]

Just checked and they seem good.... but my reason for thinking is that 2011 is the year that my nsr breaks the 120mph mark, and im curious if this may help?
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Never Ride Faster Than Your Angel Can Fly

[Teflon-Mike]

[nsr_J22_FOXEYE]

I love this place.... but instead of this turning into a banter zone lets keep it nice ... I think It is possible, 110 is reachable ... why not 120?
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Never Ride Faster Than Your Angel Can Fly

[.....]

Following that logic, then why not 500mph?

What engine mods are you doing?

[nsr_J22_FOXEYE]

Ive not set my goal off 500mph...yet .

New exhaust system, new jets, new chain and sprocket and carbon reeds.

Next on my list is... 180cc piston kit after my full engine rebuild to make sure all is lubed up and in tip top condition and I am whipping out all unessential parts I.E bulbs battery ect and me losing another 1/2 stone (11.3 atm) .... last and not least and please do not judge Nitrous in 16oz

Im aware this is going to take alot of life out of my baby, but its been a point of talk at jasper's (Plymouth biker chill out area ) for a long time... a 125cc doing 120mph , as many teenager have said it but never took it seriously, mabey not a teenager but i see the light at the end of the tunnel ....
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Never Ride Faster Than Your Angel Can Fly

[P.addy]

[nsr_J22_FOXEYE]

is that because you expect it not to end well?
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Never Ride Faster Than Your Angel Can Fly

[Teflon-Mike]

[nsr_J22_FOXEYE]

you win. but we can all have a dream....
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Never Ride Faster Than Your Angel Can Fly

[P.addy]

Im sure kickstart knows of a 125 thats achieved over 120...
but the amount of cash thrown at that you could buy a much better bike

[The Artist]

I put a small nitrous kit on my moped which was 2 stroke, 4 miles later it stopped and after a week of going back and forth to it, tinkering found out it had popped all the engine seals out.

[woodyfjr]

I agree trying to get more out of the motor is waste of time.

Really the only way 120 can be done is with aerodynamics, tall gearing and a very long strait flat surface.

If you are trying to get more try this site:https://www.125ccsportsbikes.com/forums

PS. My RD250 did 101 in 1981 after 3 miles flat out with a speeding ticket to prove it from a very pissed off policeman in a Ford Granada. Ahh the good old days.
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If you don't pay your exorcist you can get repossessed.

If you have to rev it! Don't Buy it!

[Kickstart]

Hi

Yep, 120 will take about 45hp. And not a hope in hell of getting that from an NSR engine (big bore kits tend not to be that well ported for top end power, so don't expect any great gain from that). Even 110 is going to take 33hp or more with good aerodynamics, and that is going to need about 1/3 more power than a full power NSR can manage (and the NSR doesn't have good aerodynamics).

The weight you lose will make negligible difference to the top speed (weight makes a tiny difference to rolling resistance as its only affect on top speed, and rolling resistance is pretty irrelevant compared to wind resistance at any reasonable speed).

Also the more you tune an engine the narrower you tend to make the power band. You could theoretically land up with 45hp at (say) 11k to do 120mph, but 30hp at 10k so not enough to pull much past 100mph in top. the NSR gearbox ratios are too wide to get around this.

All the best

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

[0ddball]

As an excercise in point proving it would be possible with real nitrous, i.e a £500 wet kit properly set up. Not these ridiculous scooter boy kits that use tiny co2 cartridges.

[Teflon-Mike]

[nsr_J22_FOXEYE]

I am genuinely enjoying the turn out of this thread, its very informative... But I do see the end result but where's alain?
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Never Ride Faster Than Your Angel Can Fly

[0ddball]

Oh no doubt it would be highly impractical. As i said, only worth attempting if someone had a point to prove for high speed testing. Having used it plenty in the past i'm against it's use for road use as it's expensive, impractical and should only be used to make something that's already fast enough even faster. Not to make something slow into something fast.

Injection straight into the reed block would probably do it and as said, a much better exhaust would be needed for the massive increase in gas flow. 35bhp jets would probably do the job and give a real increase of 20bhp if dialed in correctly. Ignition could be retarded crudely but if i even thought about doing it i'd want an aftermarket cdi with switchable maps and possibly an EGT gauge and wideband lambda to keep an eye on the ticking bomb.

[Teflon-Mike]

[SnowTigeress]