XLR125 questions...

[Willdat?]

Possibly stupid, but would be good to know!

First - front sprocket has 14 teeth as shown, not sure where to get a suitable 12 tooth replacement (I don't want to go to the local Honda dealer and ask, long story...), also nowhere else in Nelson open on a Sat afternoon! Would be good to try a 13 tooth front too, any obvious problems?

Second, last weekend I noticed oil leaking from bottom of engine (stator cover side). Took cover off today and noticed this built in flaw, does it serve a purpose other than slowly losing all my oil on the road?

[JATZ]

Go on, go to your local Honda stealership.

I'm sure they'd be glad to see more of your money



sorry will, can't help with your questions, but can't resist a wee dig

[Willdat?]

Go on, go to your local Honda stealership.

I'm sure they'd be glad to see more of your money



sorry will, can't help with your questions, but can't resist a wee dig

Thanks for the support!

Also spot the bashplate that cooneyr helped me out with, a bit more functional than my 4" bar risers that seem to enhance my abillity to fall off...

[ADVGD]

First - front sprocket has 14 teeth as shown, not sure where to get a suitable 12 tooth replacement (I don't want to go to the local Honda dealer and ask, long story...), also nowhere else in Nelson open on a Sat afternoon! Would be good to try a 13 tooth front too, any obvious problems?

Two teeth up front is a big jump for a 125 cc gearbox and will certainly reduce your top end speed. A good rule of thumb (not 100% accurate) is 1 tooth on the front sprocket is equal to 4 teeth on the back sprocket. The change you're proposing would be the same as an 8 tooth increase on the back sprocket, that’s a big change, you'll be crawling along in 1st gear, but maybe that's what you're after??

[Willdat?]

The change you're proposing would be the same as an 8 tooth increase on the back sprocket, that’s a big change, you'll be crawling along in 1st gear, but maybe that's what you're after??

At the moment the gap between 1st and 2nd is huge. Also top speed is ~85km/h in 4th and 5th so I'm hoping that a reduction in sprocket size might actually give me a gain in top speed, or at least not much of a reduction, in exchange for an increase in pull at low speeds. I'd like to try both 12 and 13 tooth combinations to see what suits the bike best. It's never going to be a big distance tourer, just an inner city commuter bike with a bit of off road potential!

[NordieBoy]

What size is the rear sprocket?

Stock is 17/51 and the chain is a 130 link 428?

[Willdat?]

What size is the rear sprocket?

Stock is 17/51 and the chain is a 130 link 428?

Just went out and counted, rear sprocket has 50 teeth. I'd assume bike is all stock as it was very tidy when I first got it, original road bias tyres etc.

No idea on chain, or how to tell sorry?

[ADVGD]

At the moment the gap between 1st and 2nd is huge.

Unfortunately no sprocket combination change will fix this, what you are describing is this particular bikes gearbox ratios.

Also top speed is ~85km/h in 4th and 5th so I'm hoping that a reduction in sprocket size might actually give me a gain in top speed

Sorry mate, you going the wrong way. A reduction upfront will increase RPM at top end speed (and make it scream like a toddlers tantrum if you try to push it), a reduction on the rear will decrease RPM at top end speed (if the motor has the oomph to match the gearing)

[JATZ]

Sorry mate, you going the wrong way. A reduction upfront will increase RPM at top end speed (and make it scream like a toddlers tantrum if you try to push it), a reduction on the rear will decrease RPM at top end speed (if the motor has the oomph to match the gearing)

Wot E said.... unless you reduce the size of the rear sproket, that will gain top end speed.

Wot you should be doin is ripping the guts out of the muffler, maybe a bit of re-jetting, airbox mods and most importantly a paint job

[Willdat?]

Unfortunately no sprocket combination change will fix this, what you are describing is this particular bikes gearbox ratios.

I'm not expecting it to fix it, but it should make it a little bit better, maybe the reality is that I can have a play and see if it makes a difference for not a lot of $, and I have the worst case scenario of leaving it as is.

Sorry mate, you going the wrong way. A reduction upfront will increase RPM at top end speed (and make it scream like a toddlers tantrum if you try to push it), a reduction on the rear will decrease RPM at top end speed (if the motor has the oomph to match the gearing)

The theory I have in regards to this is, in 4th top speed ~85 km/h @ hopefully max power rpm

in 5th top speed is also ~85km/h, but @ hopefully a bit less than max power rpm.

By changing the front sprocket size I'm hoping that the top speed will remain in the same ball park ~80km/h in 5th, but @ around max power rpm. Essentially bringing the gears a bit closer together. If that doesn't explain what I mean well enough I may have to revert to MS Paint diagrams and wild hand gestures!

[ADVGD]

Increasing your rear tyre diameter will increase top speed. A cheap way of doing this is by duct taping a bunch of possums to your rear tyre effectively increasing overall tyre diameter. Ideally use dead possums as live possums are too noisy

[Padmei]

Hey Will
I had the same probs with the huge gap between 1st & 2nd on Gonzo. Unfortunately the only way around it is getting more horsepower so you can clutch it on 2nd. I got a good amount of extra hp with airbox, jetting & exhaust mods. With your bike I'm not sure if you'll get that increase in performance.

With all due respect Will you've been thru nearly 10 bikes in the last 2 years. Scrimp/ save/ hit the olds up for a loan & buy a DRZ350/400 for commuting & playing. Don't spend anymore money on your bike - you'll end up spending on bent & broken parts what you could put towards a bike more suited to the riding we do.

[Padmei]

Increasing your rear tyre diameter will increase top speed. A cheap way of doing this is by duct taping a bunch of possums to your rear tyre effectively increasing overall tyre diameter. Ideally use dead possums as live possums are too noisy

That's bullsh*t I've been fitting live possums for years now -they're perfectly good - you & your dead possum ideas - Get your facts straight buddy Hummph.

Anyway I don't want this thread to deteriorate to a live vs dead possums tyre debate as most threads seem to nowadays

[ADVGD]

the only way around it is getting more horsepower

+1

Scrimp/ save/ hit the olds up for a loan & buy a DRZ350/400 for commuting & playing. Don't spend anymore money on your bike - you'll end up spending on bent & broken parts what you could put towards a bike more suited to the riding we do.

+1

I understand where you're coming from in your last post Willldat, and you may get an improvement by dropping 1 tooth up front, but there is a lot of wisdom in what Padmei says above (excluding live possum suitability, make sure you use dead possums only). With your interest to get more from a 125cc my advice would be to buy a bigger capacity bike from the get go and you will never have any regrets. I know first hand how costly it is to increase performance from a small capacity bike, it hurts your pocket big time, and you always end up wanting more

[JATZ]

Yip.... Next rideout you should try the Boys DR250, good fun around Hira, done a D.B. on it no worries and seems indi, inez, indozs, bullet proof. Then try the DR350 and if your reeeal good I'll let you take the 750 up Hurricane hill