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Slow speed up the hills. KSR Moto GRS 125 (2016)

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What could be the issue ?
carburetor
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engine
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exhaust
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its 125cc what do you expect :D
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Total Votes : 11

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siedlikmaster
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Joined: 24 Nov 2019
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PostPosted: 01:13 - 24 Nov 2019    Post subject: Slow speed up the hills. KSR Moto GRS 125 (2016) Reply with quote

Hello,

Last week I have bought KSR Moto GRS 125 (2016), only 2885 miles.
Using the bike mainly to go to work 15-20min ride. But the bike got problems going up the hill, up the hill im going only 40mph, where traffic is going 50mph. So its not really safe when cars are overtaking you all the time.
On 3rd gear im able to go about 40mph, but when going on 4th gear its just slowing down.
The bike goes to 30mph pretty fast, but after that it take time.

I have changed the oil, checked the oil filter, cleaned the air filter, cleaned the carburetor, checked if jets are clocked and checked clutch.
What could be the issue here ?
Could it be the issue with the carburetor ?
Will adjusting it give more power or something ?
Will new exhaust give it more power ?
Will bigger rear sprocket make it reach 50mph+ easier ?
Im 98KG if something.

Thanks
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WD Forte
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PostPosted: 02:24 - 24 Nov 2019    Post subject: Reply with quote

A 125 that only makes its 10.9 bhp at 9000 rpm
with a 15.4 stone rider slows on hills in high gear eh?

Pretty typical really
They didn't tell you that in the shop though did they?
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siedlikmaster
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PostPosted: 02:40 - 24 Nov 2019    Post subject: Reply with quote

WD Forte wrote:
A 125 that only makes its 10.9 bhp at 9000 rpm
with a 15.4 stone rider slows on hills in high gear eh?

Pretty typical really
They didn't tell you that in the shop though did they?


Bought it from facebook, it was my first week on the bike. Never been on scooter or motorbike in my life before that. Now I will know Very Happy

Will have to do the "Pass 2 part practical test" so I can ride something bigger Very Happy
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xX-Alex-Xx
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PostPosted: 12:20 - 24 Nov 2019    Post subject: Reply with quote

Don't bother with modifications to try and get more power. You'll spend a fortune and get almost nothing back in terms of gains. Get qualified and a bigger bike.
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Nobby the Bastard
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PostPosted: 12:36 - 24 Nov 2019    Post subject: Reply with quote

15 fucking stone? Youd be better off with a skip lorry....
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siedlikmaster
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PostPosted: 12:38 - 24 Nov 2019    Post subject: Reply with quote

xX-Alex-Xx wrote:
Don't bother with modifications to try and get more power. You'll spend a fortune and get almost nothing back in terms of gains. Get qualified and a bigger bike.


What about smaller front sprocket ? That would make average speed a bit higher ?
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Easy-X
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Joined: 08 Mar 2019
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PostPosted: 12:46 - 24 Nov 2019    Post subject: Reply with quote

My 125 was the same - built from Chinesium - and I definitely found a few hills where 5th was useless, 4th got you nowhere and a drop down to 3rd... and I'm a bit lighter than you!
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Nobby the Bastard
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PostPosted: 12:47 - 24 Nov 2019    Post subject: Reply with quote

siedlikmaster wrote:
xX-Alex-Xx wrote:
Don't bother with modifications to try and get more power. You'll spend a fortune and get almost nothing back in terms of gains. Get qualified and a bigger bike.


What about smaller front sprocket ? That would make average speed a bit higher ?


Smaller front sprocket will improve acceleration but at the expense of top speed.

It wont alter the fact hes a big boy and his bike has as much power as a lawnmower.
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Robby
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PostPosted: 15:33 - 24 Nov 2019    Post subject: Reply with quote

Use a lower gear and rev it more.

Pass your test.

Lose 4 stone.
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xX-Alex-Xx
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PostPosted: 15:49 - 24 Nov 2019    Post subject: Reply with quote

siedlikmaster wrote:
xX-Alex-Xx wrote:
Don't bother with modifications to try and get more power. You'll spend a fortune and get almost nothing back in terms of gains. Get qualified and a bigger bike.


What about smaller front sprocket ? That would make average speed a bit higher ?


If you thought your revs were high when cruising before changing sprocket, you definitely will after. If all you did was cruise around town it might be worth it, but if you need top end as well I'd leave it alone.

Side note: I've always found going up on the rear to be better than down on the front, more mechanical advantage to turn the wheel, and the chain won't have to turn a tighter radius to go around the front sprocket. Does mean you'll likely need a longer chain though.
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Nobby the Bastard
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PostPosted: 16:00 - 24 Nov 2019    Post subject: Reply with quote

The only time I've ever bothered with messing with hearing (aside from the tuned dt50 that had a power band as wide as posh spice) was to raise the gearing on the fz to make motorway riding less busy.

Bike manufacturers spend millions developing them.if that's the gearing they selected,they're probably right.
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xX-Alex-Xx
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PostPosted: 18:33 - 24 Nov 2019    Post subject: Reply with quote

Manufacturers go for a "one size fits most" setting at the end of the day. Everyone rides different roads at different times of year at different altitudes at different speeds at different loads etc etc etc.

Do you still ride the same OEM tyres, or go for something more sticky, or maybe something that lasts longer? Same thing....
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TbirdX
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PostPosted: 18:49 - 24 Nov 2019    Post subject: Reply with quote

Only ride down hills in future.

Hope that helps.
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DisAdam
L Plate Warrior



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PostPosted: 23:14 - 09 Dec 2019    Post subject: Reply with quote

people say 15 stone is alot, i'm 20 stone and ride a 125cc jesus, lol
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Riejufixing
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PostPosted: 23:52 - 09 Dec 2019    Post subject: Re: Slow speed up the hills. KSR Moto GRS 125 (2016) Reply with quote

siedlikmaster wrote:
Using the bike mainly to go to work 15-20min ride. But the bike got problems going up the hill, up the hill im going only 40mph

How steep is the hill?

You've got 10.9 bhp, approximately.

You're 98 kg (say 100kg) 150 kg, total 250 kg. That's about 550 lbs.

1 hp lifts 33,000 pounds one foot in one minute

So for a given gradient, forgetting about wind resistance etc, you should be able to calculate your top speed up the hill.


On the other hand, you might be better off simply measuring your top speed on the flat. You should get 60-65MPH if all's well.

It's an advantage to crouch down on the bike to reduce wind resistance.
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Riejufixing
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PostPosted: 00:03 - 10 Dec 2019    Post subject: Reply with quote

Robby wrote:
Use a lower gear and rev it more.


Considering the above, siedlikmaster, your bike's peak power comes in at 9,000 RPM.

When you're going up a hill, for peak performance, your engine's RPM should be about that. If it's bogging down, go down a gear to increase the revs.
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