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Derbi Senda 50 de restricted?

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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 21:14 - 22 Jun 2016    Post subject: Derbi Senda 50 de restricted? Reply with quote
If you saw my other post you will know that my friend has bought a Derbi Senda 50cc. We bought it because I got it for a very good price off a friend and that they can supposedly do 60 mph stock de restricted. When we bought the bike off him he told me that he could get 55-60 mph out of it. But then he took it for a service and since then it is only going 35-40 mph. Could they have just down jetted the carb or restricted the air filter? Any replies would be appreciated Mr. Green

Last edited by Charliemay165 on 16:34 - 27 Mar 2019; edited 1 time in total
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rhys99
Scooby Slapper



Joined: 23 Feb 2015
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PostPosted: 21:17 - 22 Jun 2016    Post subject: Reply with quote
Your mates full of shite. Mine would read 65mph while doing 53...
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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 21:21 - 22 Jun 2016    Post subject: Reply with quote
It's not just him who have had that speed... Many others too.
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rhys99
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Joined: 23 Feb 2015
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PostPosted: 21:22 - 22 Jun 2016    Post subject: Reply with quote
charliemay165 wrote:
It's not just him who have had that speed... Many others too.
And many other people are full of shit. 60mph is of course do-able with modifications...
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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 21:25 - 22 Jun 2016    Post subject: Reply with quote
Okay then, the speedo read 60 mph. Happy? But anyway you seem to know what you're talking about. What do you think is prohibiting the bike from getting to its full power?
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rhys99
Scooby Slapper



Joined: 23 Feb 2015
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PostPosted: 21:29 - 22 Jun 2016    Post subject: Reply with quote
charliemay165 wrote:
Okay then, the speedo read 60 mph. Happy? But anyway you seem to know what you're talking about. What do you think is prohibiting the bike from getting to its full power?
My thoughts would be on the carb, however no reason a garage would of touched it if it was running fine. Why not just ask them what they did?
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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 21:45 - 22 Jun 2016    Post subject: Reply with quote
He hasn't ridden it for a year it was sitting in his garage since he turned 18. I can ask him but depends if he has the time to a ask them. I will check the carb tomorrow and report back Cool
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Rob W
World Chat Champion



Joined: 09 Nov 2004
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PostPosted: 21:49 - 22 Jun 2016    Post subject: Reply with quote
Most likely that your 'mate' is a bullshitter, and it only ever did 35. All this about a service and it suddenly losing 20mph is bollocks.
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Charliemay165
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Joined: 22 Jun 2016
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PostPosted: 21:55 - 22 Jun 2016    Post subject: Reply with quote
Jesus why is everyone on this forum so hostile? Okay so if it did only got 35 where is a good place to start looking for the restrictions? I have read that the restrictions are a washer in the exhaust and a little pipe coming off the down pipe that needs to be sorted. Aswell as a small main jet that needs replacing with a 105 jet. Then I need to remove the air intake restriction washer and replace the front sprocket with a 14t one. Is that about right? Would like a reply that doesn't include the words b*llshit or any other profane language. Be nice!
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The Shaggy D.A.
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Joined: 12 Sep 2008
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PostPosted: 22:19 - 22 Jun 2016    Post subject: Re: Derbi Senda 50 de restricted? Reply with quote
charliemay165 wrote:
Any replies would be appreciated Mr. Green


But only replies you like, apparently.
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 00:00 - 23 Jun 2016    Post subject: Reply with quote
charliemay165 wrote:
Jesus why is everyone on this forum so hostile?

Because it's like walking into a Mc Donalds, ordering a regular hamburger, then asking the chef how to turn it into a steak supper... because either you cant afford a steak supper, or you are too young to be trusted with a steak-knife... but either way, you bught a buldy hamburger, and it ent never gonna be a steak supper!

Mopeds cannot be de-restricted - the 'restrictin' that makes them a 'moped' is on your driving licence, where catagory regs say it must be under 50c and not capable of more than 35mph or whatever the EU mandated conversion from french happens to be these days.

You can 'modify' a moped from manufacturers stated specifications to go faster than regs for a moped allow... but then it ent a moped any more... it's a motorcycle, and even if it was modified to be capable of such heady speeds of maybe almost 60mph?.... still a rather pitifully slow one.

Granted, it's not as abhorent perhaps as the kids round here tearing about on un-registered, un-taxed, un-insured pit-bikes lidless and licenceless... But in the grand scheme of things? Its hardly a bit of criminal genius; and at least those pit-bike pratts with 110 or 125 or even 140cc motors in them are get the reward for the risks they take... but its not much of a step up the food chain.
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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 12:07 - 23 Jun 2016    Post subject: Reply with quote
Thank-you very much for the detailed reply, I have the Derbi Senda DRD PRO 50 sm model. I think the bracket that the side stand is attached to must be bent. I will upload pictures shortly. Also stock de restricted and sports exhaust is probably the most I am going to do to the bike. Them clutch springs look good also. So you said about the fuel tap being unreliable. Do you think I would need to replace it when I get it de restricted? Also I intend on using the stock carb, I was told that I should use a 105 main jet. Cheers
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 12:13 - 23 Jun 2016    Post subject: Re: Derbi Senda 50 de restricted? Reply with quote
James_Dean wrote:
78cc...extra torque...


https://memecrunch.com/image/5213d63aafa96f1191000010.jpg
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 12:27 - 23 Jun 2016    Post subject: Reply with quote
Extra torque =/= cheap parts.
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 15:53 - 23 Jun 2016    Post subject: Reply with quote
James_Dean wrote:
Paddy. wrote:
cheap parts.

No such thing as a premium/upgrade woodruff key, it's genuine wear n tear after many many miles Karma

Err.... woodruff key.. a half penny washer that sits between two non-moving parts to provide keying location..... HOW in the hell can you 'wear' one out exactly?

And yes, there ARE better grades of key! I have had a pre-Honda Montessa for thirty years; it has a heavy Motoplat rotor for smoother low-speed running, a state of de-tune for seriously low-down torque for trials, and notoriously VERY 'weak' rotor key, prone to shearing.... but generally only if the rotor isn't fitted properly, the taper cleaned & lightly lubed and the rotor nut properly torqued.. Ie the primary drive locked before trying to tighten it, AND remembering its a left had thread and no-one has stripped the threads in previous attempts to take it off.

Meanwhile.... ALL that money on parts to make a slow-ped, infinitesimally less slow, less reliable, less economical, less valuable, less legal, and not a moped... and endow it, maybe, when it actually plays ball and works..... with about as much performance as a Chinky CG copy motor cruiserette! Genius!! Shear genius,
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'
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Monkeywrenche...
Nearly there...



Joined: 27 Mar 2015
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PostPosted: 16:19 - 23 Jun 2016    Post subject: Reply with quote
Sometimes it's fun to try and make your 50 go a little quicker, at 16 me and everyone of my mates were ringing the absolute last mph out of our bikes and I think that led me to love bikes all the more and continue the hobby.

As a Caveat though the plod genuinely didn't seem to care back then, never knew anyone who got in trouble for it
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bassmastergen...
Nitrous Nuisance



Joined: 15 Jun 2011
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PostPosted: 17:02 - 23 Jun 2016    Post subject: Re: Derbi Senda 50 de restricted? Reply with quote
charliemay165 wrote:
Could they have just down jetted the carb or restricted the air filter?


Yes, definitely. When mechanics have time left over at the end of carrying out a service and they're bored they like nothing better than downjetting people's bikes and fitting restrictive air filters.

That, or your mate's a bullshitter.
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Charliemay165
Borekit Bruiser



Joined: 22 Jun 2016
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PostPosted: 17:11 - 23 Jun 2016    Post subject: Reply with quote
Okay so I looked through the service paper and it says that the carb jet is an 85. Which from what I had read online seems about right. What else could be restricting it? The exhaust perhaps? I haven't counted the amount of teeth on the sprocket but it should be 15t if I am correct? They also charged him extortionate amounts for small things such as £9 for a spark plug and £5 for a new jet! So the carb should be fine and I was told the air box restriction doesn't really have an effect. So it could just be the exhaust and front spocket?
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 02:03 - 24 Jun 2016    Post subject: Reply with quote
You cannot 'wear' out parts that don't 'rub'.. a woodruff key is specifically intended to stop two parts having any relative motion, and therefore rubbing, therefore you cannot 'wear' one out. Only way it'll break is if its grossly over-loaded... or badly assembled... aided or abetted by being a shit-metal 'pattern' part.

Gunning it up steep inclines while slipping the clutch in higher gears for more grip like these inclines...

Shocked ? Shocked

https://scontent-lhr3-1.xx.fbcdn.net/v/t1.0-9/12341324_1101084799916436_4953802480726848187_n.jpg?oh=60c38851e5ce5d16cb5c66b89808bf59&oe=57F23F02

You know, I usually let the tyres pressures down a few PSI for 'traction' and use momentum, when I can, to minimise how much I eed, and don't have to negotiate a nadgery obstacle half way up a 45 degree slope, and I do it all clutch-out for 'control..

But Fuck-Me... I must have bee doing it all wrong for forty years!
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'
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