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Engine Jerking after a service on a ybr 125, please help

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ttboy1988
Two Stroke Sniffer



Joined: 14 Dec 2009
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PostPosted: 02:30 - 10 Jan 2013    Post subject: Engine Jerking after a service on a ybr 125, please help Reply with quote
Sorry if this is the wrong section of the forum, I just had my 7000 mile service for my ybr 125 (2011). When i rode the bike back home the engine seems to be making a jerking sound while the throttle is being used.
If i press the clutch down and let the bike roll at a certain speed you can hear the engine jerking, This was not an issue prior to the service.

No sound from the engine when it just on, only when throttle is engaged

The bike was spot on prior to the service, but it sound like a lawnmower jerkin

Any advice would be appreciated, i had the service at Yamaha dealer in birmingham.
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jeddy11
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Joined: 06 Jul 2012
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PostPosted: 02:59 - 10 Jan 2013    Post subject: Reply with quote
Take it back to where you had it serviced and explain to them the problem..
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Imonster
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Joined: 18 Oct 2006
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PostPosted: 03:15 - 10 Jan 2013    Post subject: Re: Engine Jerking after a service on a ybr 125, please help Reply with quote
ttboy1988 wrote:

If i press the clutch down and let the bike roll at a certain speed you can hear the engine jerking, This was not an issue prior to the service.

No sound from the engine when it just on, only when throttle is engaged



Forgive me if I'm being thick due to the unholy time of the morning, but the two above statements seem to be contradictory? If the clutch is engaged, then the engine will be idling exactly the same as it would be when the engine is on without the throttle being engaged...

At a long shot guess though, they've tightened your chain to the recommended variance, but you've got a tight spot in it that's causing the feeling of jerkiness in the engine. Just a guess mind - as said, take it back and see what they say.
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ttboy1988
Two Stroke Sniffer



Joined: 14 Dec 2009
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PostPosted: 03:33 - 10 Jan 2013    Post subject: Re: Engine Jerking after a service on a ybr 125, please help Reply with quote
Imonster wrote:
ttboy1988 wrote:

If i press the clutch down and let the bike roll at a certain speed you can hear the engine jerking, This was not an issue prior to the service.

No sound from the engine when it just on, only when throttle is engaged



Forgive me if I'm being thick due to the unholy time of the morning, but the two above statements seem to be contradictory? If the clutch is engaged, then the engine will be idling exactly the same as it would be when the engine is on without the throttle being engaged...

At a long shot guess though, they've tightened your chain to the recommended variance, but you've got a tight spot in it that's causing the feeling of jerkiness in the engine. Just a guess mind - as said, take it back and see what they say.



Sorry i dont think i made it clear, when i am crusing along at 30mph and when slowing down and then i press the clutch the down and while slowing down just to hear the engine. you can hear is jerking.

I can also hear some chain noise as well. I might just take it down to them, i have a feeling that its been tightened too much
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trevor saxe-coburg-gotha
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Joined: 22 Nov 2012
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PostPosted: 04:57 - 10 Jan 2013    Post subject: Reply with quote
By jerking do you mean the revs (the speed of the engine) are rising and falling?

What work was undertaken at the service - do you have an itemised invoice or receipt?
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ttboy1988
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Joined: 14 Dec 2009
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PostPosted: 05:25 - 10 Jan 2013    Post subject: rubbing noise Reply with quote
trevor machine wrote:
By jerking do you mean the revs (the speed of the engine) are rising and falling?

What work was undertaken at the service - do you have an itemised invoice or receipt?


What i mean by jerking is, its like hiccups witha 3 seconds gap, when the throttle is ingaged or (clutch pressed down while slowing down).

Tbh the its ousnds like the chain is rubbing against something or something is a bit too tight.

The service included
Bulk oil
Lubes/spray/grease
Sump Gasket 14mm
NGK spark plug
Bulb
Break pad kit

So just a pretty much normal service. The bikes chain has been adjustened, i think i let it goo a bit too loose and back break has been adjusted and the gear changes are very smooth compared to before as it was a bit jerky and but this is just a new rubbing noise.
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trevor saxe-coburg-gotha
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PostPosted: 07:05 - 10 Jan 2013    Post subject: Reply with quote
Sure they've put the right plug in? If the chains got roughly an inch / inch half play that shouldn't be causing any trouble.
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Teflon-Mike
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Joined: 01 Jun 2010
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PostPosted: 07:09 - 10 Jan 2013    Post subject: Re: rubbing noise Reply with quote
ttboy1988 wrote:
What i mean by jerking is, its like hiccups witha 3 seconds gap, when the throttle is ingaged or (clutch pressed down while slowing down). .

Trying to understand your symptoms from your description is, I am afraid tortiouse. You are not doing a lot to help us help you here.
BUT... comment bolded strikes chord of worry.....
I presume that you mean AS you are slowing down, you have the clutch 'in' drive removed from the rear wheel....

WHY!?

You should NOT be doing that. If the bike is moving, unless you are changing gear, the clutch should be engaged, the back wheel being driven.

Clutch ONLY goes in when you are ALMOSTR at a dead stop, or BRIEFLY while changing between gears.

What you are doing, by the sounds of it is 'Coasting' or 'Free-wheeling', and it is BAD.

You are denying yourself engine braking, for a start off, as well as control, and balence. Bikes hold themselves up as long as there is force on the driven wheel; take that force away and you have halved the stability.

I SUSPECT, that the reason you are doing this, is also becouse you are short-shifting, and using too high a gear to begin with, and you are making work for yourself having to come down so many gears when you slow to a junction..... also bad... bike should be in a 'responsive' gear, and at 30mph or so you ought not really need a gear higher than second or third. But I shall wait for you to elaborate on that suggestion.

Meanwhile; 2011 YBR.... I have a feeling that;s the change-over year between carbs and fuel injection; could be a late registered carb model or early registered fuel injection model.

BUT: if its a fuel injection model..... moment you pull the clutch in, the fuel injection system will go to the 'idle' setting, presuming that the bike is 'stationary'... but its not, you are free-wheeling....

Injection system is chucking fuel into the motor JUST to keep it turning, when IF you had the clutch out, it wouldn't need to... back wheel would be making it keep rotating through the gearbox...

So you are wasting petrol to keep the engine turning, rather than using momentum, and worse, rather than using that engine to waste your momentum, keeping it turning, you are wasting that momentum with the brakes, so you are burning MORE fuel to wear out MORE brake pads and ride LESS safely!

Before going back to the garage, who if you try explaining your problem as clearly to them as you did to us, will be just as perplexed and confused....

Try riding the thing properly...... see whether the 'jerkiness' goes away..... I suspect it probably will, but I will wait and let you report back.
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Rogerborg
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Joined: 26 Oct 2010
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PostPosted: 09:53 - 10 Jan 2013    Post subject: Re: rubbing noise Reply with quote
Teflon-Mike wrote:
I am afraid tortiouse.

https://ccjm.dnsd.me/scary-tortoise.jpg

Chain is too tight, plug cap isn't back on correctly, plug is wrong or not inserted correctly.

If you can't sort it in 5 minutes, then they'll be able to.
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