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I bouggt a derbi senda drd 125 R on a 61 plate I bought it off a young lad but its been messed about with, its only doing 55mph but their ment to do 75mph would a larger jet cause it to run slow? As I checked it the other day and it has a 115mm not a standard 100 mm

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Hi there,
The true top speed of the Derbi Senda DRD 125 R/SM is actually supposed to be 77mph, having the same bike but the SM model I can say confidently it doesn't go that fast unless it is my weight!

If the lad you have bought it off put in a 115mm jet into the carb this could be a reason why you are lacking speed
People believe by upjetting their carb it makes the bike go faster but this isn't always true, you usually upjet to cater for other modifications such as big bore kit, sports exhaust or performance air filter.
Personally I would change the jet back to what it should be and try from there, unless you wanted to spend countless hours fiddling with the air/fuel mixture trying to gain the right amount of air for the size of jet

Hope this helps

Posted on Jul 22, 2013

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Posted on Jan 02, 2017

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SOURCE: engine not running

Your carb should have another jet. What you cleaned was the main jet in the center of the carb. There should be another jet called a pilot jet. Often it has a metal plug covering it up so the setting can not be changed at that point. Instead, they want you to change the setting with the pilot air screw. In each case, if you remove the screw, count the number of turns for removal and put the screw back the same number of turns.

The pilot jet controls the idle. It picks up gas from the float bowl then the gas gets metered by the jet and the air screw then passes through a circuit (drilled passageway), in the carb casing and comes out in the center of the carb close to the needle jet. You will need to get the jet and circuit cleaned.

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Posted on Jul 08, 2009

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SOURCE: 50cc 1999 derbi senda

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Decarbonise the exhaust system.

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Phillip

Posted on Oct 16, 2009

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SOURCE: fitting back kick start spring mechanism derbi

Hi I have a derbi senda sm 2005 Just brought a kickstart shaft but carnt rember how to fit it n how the springs go If any1 can help please let me no

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