Derbi Senda 125 Baja Sm - 4 Stroke - VERY VERY SLOW - 60mph?

[B3NN10N]

Hi folks.

I have just bought a Derbi Senda 125 Baja (2010 UK model) and I am very very disappointed with its performance. My last 125 was a TZR and it was pretty unreal for a 125 but being older and wiser I have settled for a 4 stroke which suits my height and without the bee in the jam jar sound.
The top speed of the Derbi is a shameful 60mph and I am told it is the engine out of a Honda Cityfly which also shares the shameful top speed.

Basically the reason for this thread is to pose the question - How can I get more Power?

I don't mind spending the cash as it will make the bike safer if i can get an extra 10-15mph out of it but I have no idea how to do this and no one seems to want to know in the local bike shops.

Any information would be greatly appreciated and comments like 'buy a bigger bike' and 'buy a 2 stroke' wont be appreciated.

Any hows - thanks in advance!
Andy.

[MattJ]

If you want a faster bike, get a bigger one. Why get a 125cc 4 stroke if you want a higher top speed?

[B3NN10N]

How did I know someone would suggest a bigger bike.... The answer is maybe because I am on L plates and didnt want a 10 year old 125 bike with 40 previous owners??

Thanks for the higher gearing idea but I don't think I will go down that route.

[G]

[B3NN10N]

Kinda figured this would be a waste of time but I would still rather have the sound of a 4 stroke over a 2 stroke.

The plan is to complete my full test after being sensible and gaining road experience on a 125. So I dont jump on a VFR400 and die or break my back etc!!!!!!!!!

Being 6 foot 4 - find me a 2 stroke that doesn't look like i am riding a monkey bike!!!! Hence the benefit of the baja being suitable for my size.

[B3NN10N]

Ps I don't appreciate the comments because it is simply stating the obvious without thinking about the initial question...

[B3NN10N]

Baja is still bigger in size than the DT.

[MattJ]

[jimbothe]

https://www.fixya.com/motorcycles/t4641112-want_more_horsepower

^^ Don't know if that helps or not.

What I really wanted to put was this

https://i22.photobucket.com/albums/b342/jgillard/TOWINGROPE.jpg




BUT I did put something constructive on as well.
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[G]

In the end, you ARE going to have to make a sacrifice - aesthetics or performance. And yes I DID think about your question; and came to the same conclusion; that a 2 stroke or bigger bike was the best and only not-silly option.

CRM125 is no doubt bigger than your current bike too.
TDR125 also.

Generally the 2 strokes are bigger because they make more power, so have more normal bike design requirements.

Oh and VFR400s look 'silly' with taller riders.
And if you're riding sensibly, you won't break your back.
If you aren't, it's quite easy to do it on a 125 too.

[B3NN10N]

The voice of reason....

Firstly - The VFR was an example merely to illustrate the dangers of inexperienced riders on crotch rockets... I have no desire to purchase one.

Secondly - It may be possible to severly hurt yourself on a 125, I wont disagree with that but it is more likely on a larger bike!

You seem to be picking semantics in a childish way.

Other people.
Thanks for the positive contribution. I think it shall remain standard.

[P.]

[G]

From my experience, I crashed small bikes a lot more and generally hurt myself more on small bikes on the road (bar one big accident on a big bike - but I was doing a balance point wheelie at 60mph or so and had ignored some previous signs which I shouldn't have that something was going to go wrong.)

[lilredmachine]

You can have a decent 4 stroke 125, you just have to do your research first and look at the facts in front of you.

My 125 was an MZ SM, it was only a 4 stroke but it was a 4v, DOHC, 6 speed motor with a KTM cooling system that was bang on the 15hp limit for learners in a sweet, light supermoto frame with decent wheels, tires, brakes and suspension. It would maintain a realistic 75mph on the flat, 80+ on the downhill sections and 65 up relatively steep inclines. I weigh 16 stone and am 6"1 and it fit me like a glove. It also managed 110mpg, though obviously not at the same time as being flat out.

You can find relatively recent ones cheap as chips as they are made by MZ and therefore have bolluck all resale value.

Being a slightly more advanced engine than usual they also responded well to tuning, the one in this picture was chucking out 18hp @ the rear wheel. Doesn't sound much but if you consider a CG125 will struggle to make 11...
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Bikes: too many, too much for one man to maintain anyway.

[B3NN10N]

This is the bike in question.

Pretty in appearance but a slug in performance.

Probably a good thing as it will get me off my ass to get something bigger!

Thanks guys.

[the95th]

4T 125's and L plates are deeply linked for one reason.

L's arnt allowed on the motorway, so you cant go over 60
4T 125's are the most sensible 125's therefore they do 60.
if you want a quick 125 that don't make you look silly and allow you to speed/break the law take out your 125 engine and replace it with a 250. Youll get the speed, youll get the bike you want, and youll still be breaking the law.

go over 60 on a L plate and you mess up. Which we will ( im a learner to) eventually. your insurance wont cover it if its found you were speeding. So why not go the whole hog?

On a serious note. Why do you need to go over 60 anyway? all the roads have a speed limit for a reason. Its better to remain in those speed limits because Learners dont have the experiance to deal with sticky situations like taking a bend and sliding on oil or shit on the road. Wait untill an instructor has turned around and given you a bit of paper that tells you your an adequate rider before you think you personally think you are.

Just stick at 60. If all your mates have 33bhp rs125's and you want to keep up with them, just hang back 3 corners, and you can overtake them while their either fixing their bikes or fishing them out of hedges.

Or better yet! find a friend who is an experianced rider, and youll realise they only cane it infrequently and only when it is safe to do so, ie. no one else is around!


However to solve your problem, change the sprockets, front one goes up, back one goes down. Youll gain 5mph but will slow down your acceleration by a while.

just take your test.


deal with it.
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2004 Rieju Rs2 Matrix 50cc, 1982 Honda CG125, 1986 Honda Cm125, 1982 Honda Cb125..... I kill a lot of 125's

[B3NN10N]

oh yeh. It was worth a Q as I am a firm believer that slow bikes are very dangerous!

With a slow bike like this - I am being over taken very frequently with lots of people doing so in a chance situation. If the bike had an extra 10mph then this would be reduced as it is perfectly legal to do 70mph on dual carrageways and my commute includes many of these!

I am not searching for the 33bhp 125 like you think. I want to learn safely and become the competant rider but that 10mph extra would mean a great deal.

Im 26 - my bike history includes many field bikes, a dt50 at 16 and a tzr125 (105mph) at 17 and I have never injured myself etc so I would like to think I am cautious and competent but simply looking for road experience at a safe level.

The sprocket idea will lose the vaulable accel so I just wont bother and I will remember to never ever but a 4 stroke 125 again.

[temeluchus]

hate to spoil your fun but the national speed limit is 60.
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[MinhDinh]

Doing a test and passing is valuable learning in itself. It isn't like if you're crap that you will pass. Also riding a bigger bike is not life threatening as you make it out, it is all to do with your own self control. If you want to ride at 70 on a 400, then why not? No one will force you to go more.
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Hit the G spot.

[G]

[B3NN10N]

Temeluchus

National speed limit on dual carrageways and motorwats is 70mph unless stated like built up areas.

Single carrageways is 60.

I just got 50/50 on my bike theory!

[Teflon-Mike]

[Glenben92]

Do the test and get something that can handle the roads you need to travel on.

You've said you're 26 so you can do DAS or A2, your choice.

You've said that you've been riding since at least 16 and have owned an illegally derestricted TZR125, whether your claim of 105mph is from personal experience, I can't say.

You've told us that you've just aced a theory test.

Yet you still say you're remaining on a 125 for "practice"... how much practice does somebody need? I was riding abit under a year on a 50cc ped and 6 months on a geared 125 before doing my test and I pissed it at 17 with no real tuition.

alternatively you can buy another illegally derestricted 2t (although even if it is restricted, it should do what you're asking from it at 15bhp), forget about how much you can or can't pose on it and choose safety over style.
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[Frost]

[Teflon-Mike]