Engine Specifications

[mild_slevin]

Hi,

 

I saw those technical specification of each bike, been pondering how does these each setup would deliver a different riding experience. I been wondering how does these information helps us when buying the bike. OR personally what specifications you would like to look into when buying bike?

 

For example : Daelim Roadwin R

 

LENGTH x WIDTH x HEIGHT(mm) 2,025 X 764 X 1,180

WHEEL BASE(mm) 1,380

GROUND CLEARANCE(mm) 150

SEAT HEIGHT(mm) 780

DRY WEIGHT(Kg) 162

ENGINE SYSTEM WATER COOLING

4 STROKE DOHC 4 VALVE

DISPLACEMENT(cc) 124.1

BORE X STROKE (mm) 56.5×49.5

STARTING SYSTEM ELECTRIC START

TRANSMISSION 5 STEP RETURN

IGNITION SYSTEM FULL TRANSISTERIZED

FUEL TANK CAPACITY(l) 15

TIRE (FR), (RR) 110/70-17, 140/60-17

SUSPENSION (FR) / (RR) TELESCOPIC / SWING ARM

BRAKE (FR) / (RR) DISK / DISK

FRAME TYPE DOUBLE CRADLE

 

& Yamaha YZF R125

 

Engine -

Engine type: Liquid-cooled, 4-stroke, single cylinder, 4-valve, SOHC

Displacement: 124.66 cc

Bore x stroke: 52.0 x 58.6 mm

Compression ratio: 11.2 : 1

Maximum power: 11.0 kW (15 PS) @ 9,000 rpm

Maximum torque: 12.24 Nm (1.25 kg-m) @ 8,000 rpm

Lubrication system: Wet sump

Carburettor: Fuel injection

Clutch type: Wet, multiple-disc coil spring

Ignition system: TCI

Starter system: Electric

Transmission system: Constant mesh, 6-speed

Final transmission: Chain

Fuel tank capacity: 13.8 L

Oil tank capacity: 1.15 L

 

Chassis -

Chassis: Steel Deltabox

Front suspension system: Telescopic forks

Front travel: 130 mm

Rear suspension system: Swingarm (monocross)

Rear travel: 125 mm

Caster angle 24.2°

Trail 86.1 mm

Front brake: Single disc, Ø 292 mm

Rear brake: Single disc, Ø 230 mm

Front tyre: 100/80-17 M/C

Rear tyre: 130/70-17 M/C

 

Dimensions -

Length (mm): 2,015 mm

Width (mm): 660 mm

Height (mm): 970 mm

Seat height (mm): 818 mm

Wheel base (mm): 1,355 mm

Minimum ground clearance (mm): 155 mm

Service weight (kg) 138 kg

[Ghost_law84]

Hmm.. i was doinG research on it.. maybe can share inFoR?

Hmm.. mostly in Sg 2B biKe are all the same only u mod it

cause only 2 stoke and 4 stoke engine dun like class 2A engine got a V4 16 valve double overhead geardriven cam for this RFV 400*cc and so..

Mod does noT mean to race cause a vehicle with better part for pick up and others will save fuels

[scubasimon]

basic principles of bore and stroke apply to single cylinder 2b bikes as well. typically, the longer the stroke, the greater the torque. the larger the bore, the greater the horsepower.

 

of course, you still have to consider the other components like carb vs efi, cams, valves, gearing etc etc etc.

[mild_slevin]

not long ago I read one article, which mention about SOHC and DOHC

SOHC = simple, fewer components hence lighter provide low end torque

DOHC = complex, capable of implementing variable valve timing, spark plug at optimal firing position, more components hence heavier more power at higher end

[mild_slevin]

Hmm.. i was doinG research on it.. maybe can share inFoR?

Hmm.. mostly in Sg 2B biKe are all the same only u mod it

cause only 2 stoke and 4 stoke engine dun like class 2A engine got a V4 16 valve double overhead geardriven cam for this RFV 400*cc and so..

Mod does noT mean to race cause a vehicle with better part for pick up and others will save fuels

 

pick up, actually by changing the sprockets size would able to achieve that.

If you really wanna save fuel, best leave the vehicle in factory settings... cause very very unlikely the vehicle would improve fuel consumption after modifications. Your riding habit and gear changing also play a part.

[zyrofillica]

i think sotong tyres will definitely improve fc! less rolling resistance! a fact!

[mild_slevin]

spoke rims are good too... they are light unlike sports rim... heavy

 

anyone knows what's the different chassis made is all about? Deltabox etc.

[kaiq]

Doesn't really know most of the number, just some of the basic one from my past experience.

 

In simple terms here. Correct me if I'm wrong cos these are only from my understanding.

 

Feel free to add on.

 

- 5 speed vs 6 speed.

The 6th speed is mainly for cruising. With 6 speed it means your bike has a higher top speed as compared within the same cc range.

 

- Electric start vs kick start

Electric start is necessary for bike cc bikes like 400cc and above, scrambler might be different case. Anyway, it's for convenient purpose when you want to start up you bike in the first ride of the day. It also means you need to take note of your battery life.

Kick start is manual start. Easy for small cc, harder to start for bigger cc. Requires the proper technique

 

- Dry weight vs wet weight

Dry weight means weight of bike when engine oil, petrol, etc not added yet. Calculate the final weight yourself.

 

- Liquid cooled vs air cooled

Liquid cooled means got coolant used, while air cooled means using ram air. At a traffic stop, there is no ram air, so you know what that means. Liquid cooled got it's disadvantage as you need to regularly checks the coolant level, an extra maintenance job.

Edited August 3, 2009 by kaiq

[ben1112]

Zzzzzzzzzzzzz.

 

Gear 6 is usually overdrive. Meaning drive ratio is lesser than 1. Gear 5 is usually close to 1. 1:1 means driven and drive gears are spinning at the same speed. If you know your gears you will understand what i am talking about.

 

If you know what you are doing, and mod your bike, it is possible to be more fuel efficient. And it is heavily based on your wrist, after power increase u gotta twist ur throttle open less. If u open it as before, it would travel faster than it usually would. Removing casting flaws and factory imperfections would be a good start. So does jetting as some models come too lean to pass emissions.

 

Oversquare engine = Bigger bore than stroke.

Undersquare engine = Bigger stroke than Bore.

 

Oversquare more revs. Under more torque.

But saying that oversquare produces more power is wrong.

HP = RPM x Torque x 5252 (recalling from memory)

Therefore if an increase in either yields a higher output.

 

That is all i can think of to correct some of the information presented in this thread.

[mild_slevin]

Doesn't really know most of the number, just some of the basic one from my past experience.

 

In simple terms here. Correct me if I'm wrong cos these are only from my understanding.

 

Feel free to add on.

 

- 5 speed vs 6 speed.

The 6th speed is mainly for cruising. With 6 speed it means your bike has a higher top speed as compared within the same cc range.

 

>>>read an article before, author mention that 2-stroke engine in nature narrower power band hence require more gears. Whereas 4-stroke, greater power band doesn't require that much gears. But I'm not sure what power band author referring to. hmmm. Anyone to share some point on that?

 

- Electric start vs kick start

Electric start is necessary for bike cc bikes like 400cc and above, scrambler might be different case. Anyway, it's for convenient purpose when you want to start up you bike in the first ride of the day. It also means you need to take note of your battery life.

Kick start is manual start. Easy for small cc, harder to start for bigger cc. Requires the proper technique

 

- Dry weight vs wet weight

Dry weight means weight of bike when engine oil, petrol, etc not added yet. Calculate the final weight yourself.

 

- Liquid cooled vs air cooled

Liquid cooled means got coolant used, while air cooled means using ram air. At a traffic stop, there is no ram air, so you know what that means. Liquid cooled got it's disadvantage as you need to regularly checks the coolant level, an extra maintenance job.

 

>>>air cooled, with the aide of the fins found on the cylinder block. Commonly found on some older 2B bikes, RXZ is an example.

 

 

Zzzzzzzzzzzzz.

 

Gear 6 is usually overdrive. Meaning drive ratio is lesser than 1. Gear 5 is usually close to 1. 1:1 means driven and drive gears are spinning at the same speed. If you know your gears you will understand what i am talking about.

 

>>>yup, read the specs before usually the highest gear ratio is the smallest.

 

If you know what you are doing, and mod your bike, it is possible to be more fuel efficient. And it is heavily based on your wrist, after power increase u gotta twist ur throttle open less. If u open it as before, it would travel faster than it usually would. Removing casting flaws and factory imperfections would be a good start. So does jetting as some models come too lean to pass emissions.

 

>>>good point, guess most of us over look on that issue.

 

Oversquare engine = Bigger bore than stroke.

Undersquare engine = Bigger stroke than Bore.

 

Oversquare more revs. Under more torque.

But saying that oversquare produces more power is wrong.

HP = RPM x Torque x 5252 (recalling from memory)

Therefore if an increase in either yields a higher output.

 

That is all i can think of to correct some of the information presented in this thread.

 

 

 

 

>>>you know what's TCI and CDI ignition about?

[dinie]

- 5 speed vs 6 speed.

The 6th speed is mainly for cruising. With 6 speed it means your bike has a higher top speed as compared within the same cc range.

well depending actually. most 5-gear bikes have a taller gear ratio as compared to bikes with 6 gears.

 

- Liquid cooled vs air cooled

Liquid cooled means got coolant used, while air cooled means using ram air. At a traffic stop, there is no ram air, so you know what that means. Liquid cooled got it's disadvantage as you need to regularly checks the coolant level, an extra maintenance job.

i think you meant just air flowing over the cylinders to cool it. ram air is a totally different thing..

[mild_slevin]

i think you meant just air flowing over the cylinders to cool it. ram air is a totally different thing..

 

Ram Air does it meant by collecting atmospheric air and directing it to the carb?

[kraikk]

Ram Air does it meant by collecting atmospheric air and directing it to the carb?

 

Air-cooled is not ram air. Air-cooled just means the engine is cooled by the ambient air. When you are moving more air flows over the cooling fins so it is cooled faster, and when you are not moving the engine gets hot. Usually it's not a big problem for 2B bikes.

 

Ram air is a forced induction system found on sport bikes. Basically it makes use of the slowing down of the air as it enters the intake. The air is slightly compressed, creating a pressure differential in the engine that increases power. The other benefit is that the intake air is colder (although I think this is not a great difference for bikes), and colder air has more oxygen. Again, more power.

 

Ram air is mostly used on aircraft. There are some studies on whether ram air has much effect on bikes. Most studies agree that the effect is only at high speeds and even then the effect is usually a few hp. Generally bike mags agree that Kawasaki has the best ram air, probably because of their aircraft engine expertise.

 

Here is an interesting article: http://www.sportrider.com/tech/146_9508_ram/index.html