125 revs and vibration

Blackdust · L Plate Warrior Joined: 10 May 2011 Karma :

Hi all, fairly new to the forum, and to biking aswell...

Sorry in advance for the noob question, but I have found it nowhere, and I know you guys will give me sound advice...

I have just acquired a suzi marauder 125. She runs great, is fairly new (5000 km) and get to 110 on a flat.

I had two little questions; first regarding over revving; I know 125cc like being revved, and that with correct maintenance this is ok for the engine, am I correct? If I keep her at high revs for 15 min on motorway will she explode? Or overheat better said...??

Second question I had is the following; she starts vibrating a lot at the 100 km/h mark. It is not a mechanical problem, as she is new and has been serviced by trusted mechs. So my question is; can I keep going when she vibrates? Or is she telling me to chill it down a litte?
Also, how can I know if I have reached a "max" healthy revs?? Decrease in acceleration?

So basically it is that, can I keep her going with the vibration ( which is not a fault from the bike I would swear, it is brand new and stock) or should I avoid riding her under the vibrations? ( I can cope myself as a rider with the vibrations, my concern is the health of the bike).

Thanks in advance fellow bikers, and forgive my noob question...

Seb

RhynoCZ · Super Spammer Joined: 09 Mar 2012 Karma :

Hello, welcome

The engine can not be over revved if the rev limiter works alright. Also, it won't blow up or over heat if you keep it at high revs on the motorway. The air going around the engine at reasonable speed according to revs shall keep it cool enough. By the way, if you go let's say 100 and try to kick it in 1st gear the engine will over rev of course, but no one can be that stupid to even try it.

The vibrations at 100kph, well, I'd check the tyre pressure on both wheels and maybe worth checking the spokes or you might just lost the wheel weight. It could also be the front tyre not being round enough. The vibrations shall go away with speed, but as your bike can't go any faster, I'd have the wheels checked. Start with the tyre pressure. My ZXR did that at certain speed, when I got faster it went away, the front tyre was old and bumpy. I got a fresh tyre and the vibrations are gone.

The rev thing, well I guess you just need more time on the bike to get used to it. It is hard to say when you've got no rev counter.
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Blackdust · L Plate Warrior Joined: 10 May 2011 Karma :

You sir, are a star. Answered exactly what I wanted to know!!! Thank so much! This forum is awesome.

So you recon vibrations are not a normal behavior for the bike right?

I will have wheels checked, pressure is fine as I checked this this morning ( gas station pressure thing though... Dunno how precise the things are).

And spikes, I used to adjust my own on the bycicle, but don't think it is as easy on bikes... I will have this checked and update!

Thanks again mate, much appreciated!

Blackdust · L Plate Warrior Joined: 10 May 2011 Karma :

You sir, are a star. Answered exactly what I wanted to know!!! Thank so much! This forum is awesome.

So you recon vibrations are not a normal behavior for the bike right?

I will have wheels checked, pressure is fine as I checked this this morning ( gas station pressure thing though... Dunno how precise the things are).

And spikes, I used to adjust my own on the bycicle, but don't think it is as easy on bikes... I will have this checked and update!

Thanks again mate, much appreciated!

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Hang on. The Marauder is using Suzuki's 12hp (on a good day) single and it's hardly a featherweight. 100kph / 62mph is about as much real speed as you'd expect from it. You're pushing it to its limit trying to hold it there or get more out of it.

Not that you can't try and do so, but really depends what you mean by "vibration". If you mean a high frequency low amplitude buzzing that you can feel through your hands and feet and backside, that's most likely the engine and the solution is to get a bigger one. Lower frequency higher amplitude could be wheel balance or other issues, but I'd get a second opinion before you start fiddling with it.
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Blackdust · L Plate Warrior Joined: 10 May 2011 Karma :

That definition of vibrations is correct for what I am having, it does seem as if it is engine saying this is my limit.

But then I have another question, is it unhealthy to keep it at this speed? It will not do much more, I am aware of this, she is 150 kg on the curb, and low power, but I am a featherweight! I have taken my license ( Spanish, I am limited to 500cc inicially) but want to get some biking experience before jumping to something bigger...

Thanks for your reply!

talkToTheHat · World Chat Champion Joined: 21 Feb 2012 Karma :

Is it a tingle or a judder? A high frequency vibration with the throttle pinned is normal. They'll run all day with the throttle pinned. Do you still have the stock bar weights? if they are missing fit some reasonably heavy ones. Swapping the hard stock grips for some squishier ones will help too as the stock ones are pretty horrible. I got good results with progrip dual compound ones.

A low frequency judder whilst riding flat out is not normal, and is likely a wheel out of balance.
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trevor saxe-coburg-gotha · World Chat Champion Joined: 22 Nov 2012 Karma :

Blackdust · L Plate Warrior Joined: 10 May 2011 Karma :

Thank you both Trevor and talktothehat for your answers. It is high frequ. I have been told by a mate that had a marauder and tried it that it is a normal behavior. Marauder vibrate quite a bit. I think the wife would enjoy it... ;)

Itegarding stock, aye, it is all stock, except some feet guards the previous owner installed.

Trevor, aye, I know the feeling, had been driving a 1986 honda civic dx, and I would really have to baby it. Now, with 125 engines I have put the bar down a little, and push it a little. I guess I will keep a middle ground, I do maintain it well, and I have always heard 125's like a bit of kicking...

Thank you all for your answers, I will look into all your recommendations, and as always, this community is the fu****ing bomb man!!!

Regards.