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Revs on a CG125

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Nicky-Jano
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Joined: 20 Feb 2007
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PostPosted: 18:51 - 13 Jun 2007    Post subject: Revs on a CG125 Reply with quote

Hey I was just wondering about the revs to mph on my bike and whether anyone could give me a bit of advice please.

Right, my bike doesn't have a rev counter so I basically just listen to the engine and change up a gear depending on the speed I'm going.

E.g. When I get to 20 mph I change into second, just before I hit 30 I'll go upto third.
I'll put it in fourth when i get to around forty and put it in fifth when I get near fifty.
Obviously this depends on road surface and incline/decline.

So far I have been fine with this and noticed no problem.
My bf has said I'm not using the bike's full potential but I'm not sure who is right.
Can anyone who has experience with CG's let me know whether I am using to little revs or even going too high.

Thanks.
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ncrn
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PostPosted: 19:05 - 13 Jun 2007    Post subject: Reply with quote

I've only ridden a cg round a car park, but I have ridden a very similar bike (yamaha sr125) for a while.

Basically I found that if you want its full potential, you need to keep accelerating until it just feels like the bike won't give any more, the bike starts to feel as if its slowing a little, then change gear.

For general riding though I used your tactic, accelerate to 10 change up, to 20 change up, but I always left it a bit later in 4th so I would hit around 50 in 4th then change up so I could do about 60.

By using the rev until it feels like it won't go any more tactic, I saw just under 70, and my instructor who was following me confirmed this and said he'd never seen someone go that fast on a bike like that Wink.

So in short you could be giving it a little more, if your hoping for a bit extra speed just wait a little bit longer in gear, you'll know if you're over doing it because the bike will keep getting louder but you won't be accelerating.
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veeeffarr
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PostPosted: 19:11 - 13 Jun 2007    Post subject: Reply with quote

Put it into 2nd or third and twist the throttle until the engine tone starts to sound a bit nasty, then change up a gear :/

When the sound stops 'changing' you want to change up

Dont worry about blowing it up, I ragged the fuck out of mine
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Nicky-Jano
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PostPosted: 19:19 - 13 Jun 2007    Post subject: Reply with quote

Ah right, thanks.
So I'm definitely not over doing it then Razz
Fastest I've gotten is about 62ish mph. Confused
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ncrn
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PostPosted: 19:22 - 13 Jun 2007    Post subject: Reply with quote

Nicky-Jano wrote:
Ah right, thanks.
So I'm definitely not over doing it then Razz
Fastest I've gotten is about 62ish mph. Confused


Better than my dad ever got out of his 4T, or my friend with his 4T Razz

If you want to get a quick speed, do it downhill on a dual carriage way on a sunny day with the wind behind you, make yourself as small as possible and rev the hell out of it.

You might see 65 Wink.
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Noxious89123
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Joined: 10 Jun 2007
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PostPosted: 19:32 - 13 Jun 2007    Post subject: Reply with quote

ncrn wrote:
Nicky-Jano wrote:
Ah right, thanks.
So I'm definitely not over doing it then Razz
Fastest I've gotten is about 62ish mph. Confused


Better than my dad ever got out of his 4T, or my friend with his 4T Razz

If you want to get a quick speed, do it downhill on a dual carriage way on a sunny day with the wind behind you, make yourself as small as possible and rev the hell out of it.

You might see 65 Wink.


That made me grin Thumbs Up Laughing
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teabag
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Joined: 18 Mar 2007
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PostPosted: 20:55 - 13 Jun 2007    Post subject: Reply with quote

Revs vs. MPH on a CG125 are in the attached file.

Note that maximum speed is theoretical only (and max rpm might be a bit out)!!
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Kal
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Joined: 02 Jan 2007
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PostPosted: 15:41 - 14 Jun 2007    Post subject: Reply with quote

It sounds roughly where I was changing gear.

You can thrash a CG something chronic they are fairly indestructable. I would change up when she started screaming at me and change down when she started 'chugging'

To be honest CG's are a round town bike happiest carving through traffic up to 50mph.

Best speed I ever had out of mine was 70mph. - Indicated, but also indicated in the car following me.
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Spoon261
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Joined: 21 Feb 2007
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PostPosted: 12:04 - 15 Jun 2007    Post subject: Re: Revs on a CG125 Reply with quote

Nicky-Jano wrote:
Hey I was just wondering about the revs to mph on my bike and whether anyone could give me a bit of advice please.

Right, my bike doesn't have a rev counter so I basically just listen to the engine and change up a gear depending on the speed I'm going.

E.g. When I get to 20 mph I change into second, just before I hit 30 I'll go upto third.
I'll put it in fourth when i get to around forty and put it in fifth when I get near fifty.
Obviously this depends on road surface and incline/decline.

So far I have been fine with this and noticed no problem.
My bf has said I'm not using the bike's full potential but I'm not sure who is right.
Can anyone who has experience with CG's let me know whether I am using to little revs or even going too high.

Thanks.


What year is your Honda CG125?

Does it have 4 or 5 gears?

If it’s a pre 2004 model, does it have little marks on the speedo saying, 1, 2, 3, 4, 5?

1 would be next to the maximum speed for 1st gear.
2 would be next to the maximum speed for 2nd gear etc.

I looked at a pre 2004 model and noticed the speedo markings
5th = 70mph, 4th = 58mph, 3rd = 45mph

If it’s a 2004 or later model it will not have these marks on the Speedo.
I have worked out the revs based on the speed.

Peak torque (pulling power) is at 7000rpm, Peak power is at 9000rpm.

Rpm mph 1st 2nd 3rd 4th 5th
3500 8.2 13.2 17.9 21.9 25.7
4000 9.4 15.1 20.4 25.0 29.4
4500 10.6 17.0 23.0 28.1 33.1
5000 11.7 18.9 25.6 31.2 36.8
5500 12.9 20.8 28.1 34.3 40.4
6000 14.1 22.7 30.7 37.5 44.1
6500 15.3 24.5 33.2 40.6 47.8
7000 16.4 26.4 35.8 43.7 51.5
7500 17.6 28.3 38.3 46.8 55.1
8000 18.8 30.2 40.9 50.0 58.8
8500 20.0 32.1 43.4 53.1 62.5
9000 21.1 34.0 46.0 56.2 66.2
9500 22.3 35.9 48.6 59.3 69.9
10000 23.5 37.8 51.1 62.4 73.5
10500 24.7 39.7 53.7 65.6 77.2
11000 25.8 41.5 56.2 68.7 80.9

I managed the trash a 2005 demo bikes engine in 3rd gear and got 55mph out of it = 10762 rpm. But I think that was very unhealthy for the engine (fealt like a rev limiter, but I bet it was the valves bouncing?). I could not thrash it in 4 or 5th = the wind resistance at those speeds were too great.

I would never take my 2005 CG above peak power = 9000 rpm.

I have never needed to go near peak power in 1st or 2nd. I have only needed to go to peak power in 3rd when climbing a very, very steep hill. 4th I normally change up to 5th at around 50mph if strong head wind or hill. 5th = go as fast as I can but stop it going above peak power.

The stronger the head wind / the steeper the up hill, the higher the revs need to be in the gears in order to get up quickly.

If I go up a very, very steep hill in 3rd at peak power = 46 mph the engine feels fine. If I do 46 mph in 3rd gear normally, the engine will vibrate allot and my fingers and feet will suffer terrible vibration sickness, this is bad for me and the engine.
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