Am i riding it wrong?

[bennell09]

good afternoon,

ive recently got my kmx125 mot'd taxed and insured so i can now play out. with it being my first smoker i feel i may be driving her wrong. the bike revs to 13k apposed to 11.5k on my old 4t 125 which was very slow. now when im driving my kmx i usually change gear around 4k but when im in the next gear the bike feels abit slow to rev up. now, am i changing gear well too erly and im not used to the loud 2t noise yet in high revs or is my bike suffering from a carb problem. after 6k the bike flys because of the kips valve opening and throttle response is excellent. myplug is a coffee colour and it starts first kick with no bogging or any noticable problems.

[CaNsA]

You are doing it wrong....

You RIDE a bike, you dont drive it!

[weasley]

Yes, you're changing too early and treating it like a 4T. Rev it out.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[easyroller]

Here's how you should ride your smoker:



LOTS

OF

REVS!




____________________
....unrestricted and on two wheels since '04

[bennell09]

[Kickstart]

Hi

4k is way too low. Is the bike restricted of full power? If restricted then I suspect something around 8k is as far as it is worth revving it, while if full power rev it to the red line.

However think the red line is at 10k not 13k (2 strokes tend not to be as high revving as 4 strokes).

Revving a 2 stroke beyond peak power is often very pointless as power normally drops away very rapidly.

All the best

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

[bennell09]

[Kickstart]

Hi

Ignore where the red line goes to. It is where it starts that is important. Basically the start of the red line is where it it safe to rev on a regular basis. The odd trip a bit into the red is unlikely to do much harm.

Only knowledge of the restrictions is of the older ones (decade+ older than yours) when some of it was in the power valve setup.

All the best

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

[Acemastr]

.... RAG THE TITS OFF IT

that is all.
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[Frost]

A 2 stroke engine is designed to work a quite a specific engine speed, go below or above that range by much and it won't be so sweet. The KIPS valve is an attempt to compensate for this, but in truth the bike needs to have the valve open to really be happy.
I had a 250 2 stroke where the rev counter only STARTED at 3k, so 4k is where you'd want to be changing gear if you were buying petrol by selling your organs. Change at about 6-7k when riding normally, higher when you actually want to get somewhere

[dangerousdave]

Hi fella.

You're changing up early, which is understandable as you're used to riding your four-stroke 125 which is a different animal to the KMX.

The four stoke 125's are more flexible to ride, despite not making as much power as the de-restricted two-strokes.

The KMX's, especially the 125, might feel a bit flat like you say until 6k. Above 6k is where you need to keep it when you want to get a move on.
____________________
1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[Livefast123]

The powervalve only opened on my NSR from 7500 rpm.

Take the bike by the bars and rev that mama You need to rev a 2 stroke to keep the engine in the powerband and to stop the plug getting gummed up with unburnt fuel / oil.

By changing up at 4 - 6 rpm you are getting as much power as a wet kipper and not allowing the engine to work as it should.

Take it easy until warm then use up to 10k, it'll be a much more enjoyable ride.
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Current ride - Yamaha MT-07

[Darylw27]

Take it easy for a couple of miles changing up at around 8k, once she's warmed up I'd change up just before redline. That's how I ride my NSR, two strokes like revs, lots and lots of revs.

[G]

Your old 125 was even slower, I would guess, because you were changing up too early on that.
The red line is generally a reasonable indication of where to change up on most bikes .
Some it may be a little before, but usually not much in my experience.

[bennell09]

excellent guys thanks for the info, i checked the plug last night as i do every couple of days to keep an eye on her and there is some unburnt fuel so i will start chaingin alot later then i do now, im just glads its me and not the bike one thing i will mention is, the previous owner has cut the choke cable off so ive been starting her without choke on untill the new cable arrives. is it bad practice to start the bike without choke or is it just wrong pilot jetting thats allowing me to easly(1kick) start the bike from cold?

[Kickstart]

Hi

If it will start without choke then do so. Only use the choke when necessary.

All the best

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