bike slowing down

[redelmo]

Hi all I'm having an issue with my 125cc. The bike has done 2070 miles so far and I have come across an issue where I accelerate through the gears to 4th and it just starts slowing down around 35mph, even when I go back down the gears, any ideas sorry if this kind of thing has been posted before I wouldn't even know where to start to look, thanks all for any input.

[Sload]

You should post all the details of the bike including year, model etc so the boffins have a chance
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Honda Varadero >> Triumph Speed Four >> Honda CBR1100xx

[P.addy]

You should be in 2nd/3rd at that speed on a 125.. more than likely 3rd.

Bike would help though

[redelmo]

Sorry its a keeway, rkv 125 62. Brought February.

[Walloper]

Fuel starvation.
Over fueling (Choke stuck on)
Air filter choked.

Too much hill.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[cb1rocket]

Not using the gears correctly.....
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[P.addy]

Should be able to stay in 3rd until about 45mph. Would definitely try revving it high through the gears, 125s are made to be thrashed

[redelmo]

Thanks will have a look, I normally stay around 6000 revs it goes to 12000 should I be changing at higher revs cheers for the advice

[P.addy]

[Rogerborg]

[redelmo]

Ok cheers, I know the dealer well so that's not an issue I was just hoping it was something I could sort myself.

[Rogerborg]

If it's still faltering even when you've knocked it down the gears then it's the bike, not you.

While I'm thinking, how many times have you changed the oil, and when's the last time you checked it?
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Walloper]

[redelmo]

The oil has only been changed at 1st service 500 miles - next 3000miles, I asked around at work and was told to change gear around 9000-10000 revs I tried it on the way home and past 8000 revs its screaming, I would hate to hear it redline, I change between 6000-7000 I don't know whether that could be an issue. Thank you.

[Acemastr]

[redelmo]

Sorry 1000-10000 in white 10000-12000 is red I can't get past 9000 revs sounds like its going to blow up, acceleration is fine apart from the two occasions of it bogging down. I don't want to damaging the bike.

[Rogerborg]

I'll ask again: have you checked the oil level.

2500 miles is a lot for a Chinese branded 125 to go between changes. It's a lot for a CBF125, some of them don't make it.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[dublinclontar...]

[redelmo]

I have topped up the oil slightly its never really gone down, sorry I thought you ment changed the oil. Cheers again.

[redelmo]

[P.addy]

If I put the Varadero in 5th at 30mph, it will bog and feel shit.

3rd is the highest gear for 30mph for me. 3rd takes me to 55mph, 4th takes me to 65mph, and 5th continues on to its top speed and it sits at the edge of the redline..

It is not dead yet and has over 70,000 more miles than your bike Change your oil every 1000 miles if you wants to actually make progress and rev it.

It will sound like it wants to blow up, its a bike with 1 tiny piston and a few tiny valves. They make noise.

[Acemastr]