why my honda cbr 125 respol only hitting 55-60mph

[bikersupermot...]

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Have you tried fitting a red power band - should get about 70 out of it then.
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Yamaha FZS600 (Now gone to heaven) > CBR600F4i (SOLD) > '99 YZF-R1

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[chunk1189]

Hi jamie,

I have a honda cbr myself and have faced the same speed drawbacks, from my experience and having to have work done i will give you a quick rundown of what will effect the speed on cbr 125, and pretty much all bikes in general.

Binding breaks, if you lift the bike from the ground and give the wheel a push forward or backward your looking for it to go round 360 degrees without any effort, if it does not then you have possibly dirty pistons that need a clean and the caliper cradle, also check for seals in there. also disc's can effect this.

Tyres, these will effect speed and handling (obviously) if they are to low in psi/tread you wear them out alot quicker thus impact performance, and speed.

Spark Plug, again this also effects the bikes performance both starting and speed, as a suggestion if you have not changed it get yourself an NKG Iridium IX Plug, they increase ignition and throttle response at a higher % than an average plug.

Air Filter, if it looks dirty and is none washable, replace it else wash only if washable, to test a faulty air filter if you think it may be the issue is to remove it and ride around the street corner to see if performance has improved, you can do this on a cbr 125 i have myself, just be mindful of any leaves or wrapper that could get sucked in.

Chain and Sprockets, these obviously effect speed as they turn the wheels, you will want a nice tight chain but enough to hold a bounce on the suspension, as if its to tight you can snap it simply by hitting a bump, if you are unsure ask a garage or proffesional to adjust it accordingly, also check the teeth on the sprockets make sure they are even and not worn down.

Valve Clearance, see this video for more information https://www.youtube.com/watch?v=_G-zi-M4xgs plenty of tutorials on there you can do yourself, on a side note check the carb unless you have injection model, could possibly need a drain and clean.

those are the type of stuff that will effect speed and obviously you will need sufficient and correct oil in the bike and brake fluids ect, obviously i cant list everything because even body work and you're weight in general can effect speed and performance on a motorbike, but those are all the main stuff you will want to check, if you still find no speed improvement then could possibly be an underlying engine problem, i would also like to point out and i noticed it myself the actual clock on a honda cbr 125 is out by about 6-8 mph!

P.S, do not get a 2 stroke bike, you're 4 stroke will be around well after the 2 stroke has blown up...

Regards,
Andy
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AndyFergo

[Pol Anorl]

[chunk1189]

Wasnt aware it was a spelling competition...
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AndyFergo

[P.]

Iridium spark plugs and running with no air filter.

Please tell me you don't work in a garage

To sort your post..

Brakes - Keep on top of them, remove and grease the pins.
Tyres - 29/31 psi front/rear.
Spark plug - standard one with proper gap.
Air filter - stock one, replace if dirty.
Chain - have 25mm movement and keep lubricated.
Valve clearances - Inlet 0.04 - 0.08, Exhaust 0.25 - 0.29. Check when cold.

Ignore him, a 2 stroke bike will last just as long as a 4 stroke, especially if you neglect the parts above.

[chunk1189]

yes its perfectly fine to run the bike with no air filter simply to test if there is an air filter problem but not all the time, no i dont work in a garage i never would either, as i clearly stated at the top of my post im just giving some tips and advice on my experiences and stuff i myself have had problems with since owning a cbr, again what is wrong with an iridium spark plug, they are better than just a standard plug in mine and many others opinions, again its personal choice, and yes a 2 stroke will not last longer than 4 stroke were this man is concerned since 2 strokes were designed for tracks/racing not general road use which is what hes after...
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AndyFergo

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[leechy]

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[Teflon-Mike]

[leechy]

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[Noxious89123]

[P.]

[stevo as b4]

All the OP needs to do is get his bike fixed if he is an average size and weight rider. Late model CBR125's have been speed trap tested by magazines at a true 71.5mph on a flat runway. This is more than enough speed to get from a 13bhp 125cc motorbike, although having said that the CBR125 does probably lose out aerodynamically to better shaped sports 125's.

Back in the 90's when I was 17, the original model TZR125 when fully faired could just about do 75mph in favourable conditions and that was with only 12bhp.

Looking at it positively the CBR will be 8-10mph faster in any given situation than a basic commuter 125 like the CG or YBR.

p.s It made me smile that someone was trying to make an RS125 sound more credible by comparing it to the fastest accelerating fwd car of the 1990's, when it needs no bigging up, as people know that early 90's Italian 125's are historically comparative rocket ships to most 125 tackle.

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[leechy]

ok what eva thats just your opinion which aint based on fact neaxt you will be telling me that grizzly adams had a beard! fact cagiva mitos in full power put out a estimated 37bhp according to cagiva which im pretty sure there gna know more than yourselfs and theres mitos on youtube doing 200kmh wich correct me if im wrong but thats 120ish and and the seventh gear dont mean shit its a cruiseing gear there no faster than the 6 speed fact 2 its a legal requirement that speedos have to be accurate whithin a couple of mph oh and where did you do you dyno tests then use probly nether been on a mito let alone seen 1

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[leechy]

Make Model
Cagiva Mito 125
Year
2000-01
Engine
Liquid cooled, read valve, two stoke single cylinder, electric power valve
Capacity
125.6
Bore x Stroke 56 x 50.6 mm
Compression Ratio 6.3:1
Induction
Dell'Orto carb
Ignition / Starting
CDI / electric
Max Power
34 hp 24.8 kW @ 12000 rpm
Max Torque
23 Nm @ 11000 rpm
Transmission / Drive
6 Speed / chain
Front Suspension
40mm Marzocchi telescopic forks, 120mm wheel travel.
Rear Suspension
Monoshock, 133mm wheel travel.
Front Brakes
Single 320mm disc 4 piston caliper
Rear Brakes
Single 230mm disc 2 piston caliper
Front Tyre
110/70 ZR17
Rear Tyre
150/60 ZR17
Dry-Weight
129 kg
Fuel Capacity
12.5 Litres
Consumption average
20.1 km/lit
Braking 60 - 0 / 100 - 0
12.9 m / 36.4 m
Standing ¼ Mile
14.2 sec / 149.3 km/h
Top Speed
172.3 km/h
Review Motor freaks
Manual diff.ru:8000/Cagiva_Mito_125_Repair_Manual.zip
blackbears.ru/manual/files/Cagiva_Mito_125_Repair_Manual.zip

[P.]

So about 33hp, 174kmh which is 108 (note my 110 mark above)

Well.

Done.

Chap.

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