Reply To: Gt250R de restrict?
Hey ,
It isn’t really “restricted” per se but because it is an EFi system that’s on a DAEWOO ECU (2008-2010) era
It should have
- 2 Lambda Sensors (front and rear exhaust pipe)
- Temp Sensor in the front engine head
In the past working on customer’s 250cc that was a 2009 , it did not like the fact i tried to install a K&N high flow air filter (drop in catridge to keep same airbox) and exhaust pipe changes , the exhaust gases leaned out, so the bike ran worse and leaner.
The engine was doing 90mph healthy but when i eventually got rid of the EFi system and went all carby, it still was doing 90mph, the exhaust upgrades + air filter + bigger carb jets and the like, the bike pulled quicker (a little bit more) , but top speed didn’t change much (this is on stock gearing for comparison)
It is the OLD Grey 250cc engine’s that are 2004-2006 that go to 100mph very easily. Just the nature of them. Weird if you ask me considering they still use the same internals as the efi ones in terms of pistons, crank and clutch.
Your DAEWOO ECU would be difficult to tune as there is no tuner that wants to do it and DAEWOO is out of business now (hence 2013/2014+ bikes or 2012 started using DELPHI ECU systems, but alas , if we add extra air or derestrict the exhaust , the dyno must happen and A/F checked so the engine doesn’t lean out.
It “could” survived with a stock air filter , black widow exhaust pipes (made in UK) or make your own freeflow pipes and “must” use an exhaust can that’s the same size as the OEM one and with a baffle hole the same size as the OEM one or little bigger.
A lot of people got away with changing out parts and say “bike is fine” , but they end up with more wear later down the road of its life.
I guess it depends why you ask the question vs what issue is present with your current stock 250 as it is ? Let us know 🙂
// Meditation doesn't mean you have to sit still....
