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| Scandy flick |
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Scandy flick
L Plate Warrior
Joined: 24 Feb 2013
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 Posted: 22:46 - 24 Feb 2013  Post subject: Derbi drd evo exhaust |
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Hi guys im in the middle of derestricting my derbi senda drd evo and i am eventually going to fit a new performance exhaust.I was thinking of a leo vince exhaust. Would this be a good one to buy to squeeze every drop of power out of the bike? Also do you hav any sugestions of what website do the best deal for a performance exhaust for my bike?  |
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| suzukirider19... |
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suzukirider19...
Nova Slayer
Joined: 30 Jan 2013
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| uberkron |
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uberkron
Crazy Courier
Joined: 12 Nov 2012
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| _Iain_ |
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_Iain_
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Posted: 03:54 - 25 Feb 2013  Post subject: |
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| uberkron wrote: | Peds are limited by #1 variator limiting #2exhaust flow. #3 rev limit. |
https://spe.fotolog.com/photo/30/60/87/jokeyy/1217435027781_f.jpg
Except if you actually knew your onions & weren't copy pasting from other threads you'd understand that the bike in question ISNT a moped & has a manual gearbox. Thus it doesnt have a variator as its not got a CVT transmission.
| Quote: | just drill the wasker out of the exhaust |
Washer? Whiskers?
| Quote: | have you got std gearing and thats designed to be restricted |
Not quite. It's got gearing suited to the bike, de-restricting it allows it to pull that gearing better. Sure you can up the gearing to give it more top end but you'll loose all your acceleration & will look like a right clown burning clutches out everywhere & being overtaken by pushbikes whenever you see a hill. Leave the gearing alone, if anything DOWN gear it so it'll actually pull up hills.
Okays, back on topic.
De restrict the OEM pipe as stated above, but dont fuck with big bore kits & carbs & stuff. Make sure when you de-restrict it you upjet to the correct size for that bike - online you'll find a model specific guide. A bike shop will be able to sell you a jet kit for about a tenner, in it will be ten different jets. It's all about the plug chops to get it spot on from there, and thats where you'll get the proper gains. Getting the mixture spot on, not by having brand names on the exhaust.
Either way, expect about 50mph. Maybe add 1/2mph if you put a £300 exhaust on it. Realy isnt worth fucking around with due to sheer cost of parts & the tiny gains. IF you realy want every last bit of grunt out of it then i'm quite happy to make you up a shopping list that'll come to about £1-2k, it'll give you an engine that needs rebuilding every weekend, but it'll do a genuine 70mph. Ignore what all your mates say - their bikes dont do more than about 40-50mph either, its all bollocks. Dont belive me? Get someones iPhone & download the pirelli super biker app. It'll map you on a run & give you a max speed figure at the end. Reset it, stick it in jon boi with the 100mph speedfight's pocket & see all the excuses come out.
Pop the exhaust off, drill the washer out & knock the main jet in the carb up one or two if a plug chop shows you need it. Otherwise leave it alone & sell it on your 17th birthday - all you'll be doing is ruining the resale value, which is what'll get you that nice DT125 supermoto/RS125/Mito 125/GPR125, all of which will be plenty quick enough to outrun your mates that spent all their money on carbon exhausts & anodised engine bolts instead of saving for a decent 125 
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Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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| suzukirider19... |
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suzukirider19...
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Joined: 30 Jan 2013
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| _Iain_ |
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_Iain_
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| Posted: 12:34 - 25 Feb 2013 Post subject: |
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Never owned one, no.
Got a 4t 125 commuter, boshed myself through tests ASAP & got a big bike that was actually fast.
The other threads? Have a look at em in detail. Most "i wanna tune my ped" threads have been answered by myself in the first place as nobody could be bothered. Sick and tired of bullshit merchants with huge wallets talking nonsense!
The gearing is not and can not be deemed a restrictor, its a balance of acceleration vs top speed & if you gear it up to gain a few mph top end the bike wont pull up hills as it cant lug the gearing! If however you had a restrictor fitted to the selector drum to prevent you from putting it in top gear it would be a restriction. You are talking about something completely different!
Anything other than de-restricting the OEM kit isnt worth doing. Your big bore kit, carb etc has probbably come to about the £400 mark yes? The bike does about 60? 65? The bike in the first place? £600 used?
1k for a bike thats still only worth £600 when it comes to sell up, and only went 10mph faster. I'm not being a dick, merely trying to offer some sensible advice. Had you saved the £400 on engine bits then you'd have a grand to spend on the 125 when old enough - and 1k is enough to get a ratty RS125/mito & both of those will push nearly a ton when full power.
Or spunk loads into the 50, sell it for half what you spent on it & buy a pulse adrenaline like everyone else i've ever seen with a tuned up ped.
Tl;dr - tuning dem 50's is a total waste of money & time. Lots of bad advice out there, save the pennies & get a fast 125 in a year.
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Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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| P. |
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P.
Red Rocket
Joined: 14 Feb 2008
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| Posted: 12:39 - 25 Feb 2013 Post subject: |
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Lol, newfag rage.
50cc are designed for 16 year olds to piss off people as they whizz past at 25mph.
Some Derbi's do require the actual sprocket to be changed, usually the front.
If you had the 125 you'd eek a few more mph out of it and make it a bit more fun to ride.
The 50 however is like brushing your teeth with an electric toothbrush rather than a standard one, not a lot of power to begin with, but is still as useless when it has more.
Stop derestricting it like a typical yoof, grab a 125 and ride that, its just as legal |
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| Scandy flick |
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Scandy flick
L Plate Warrior
Joined: 24 Feb 2013
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| _Iain_ |
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_Iain_
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Posted: 22:37 - 25 Feb 2013  Post subject: |
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Usually only the one restrictor washer in the exhaust, normally in the front section
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Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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| Scandy flick |
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Scandy flick
L Plate Warrior
Joined: 24 Feb 2013
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Old Thread Alert!
The last post was made 12 years, 318 days ago. Instead of replying here, would creating a new thread be more useful? |
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