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Reply To: Hello from Perth, GT250R Rider

Apr 11, 2024 at 8:16 PM #12922

Admin

Topics: 44
Replies: 2,401

🌍 Country: UK
⚡ Bike Model: GT

Hey,

For the exhaust since you want it short, i find that personally this one (is short but fat) is loud but not too loud with the DB Killer fitted inside and it will not restrict the bike, in fact , it might “too free flowing” , if you get a DB Killer, you want to crush the “inner pipe” of the DB killer itself so that the hole is about 2cm diameter. If the hole is too big (generally with these aftermarket mufflers aimed at 600cc bikes) , the 250cc will lose some torque.
This one
https://www.lextekproducts.com/part/YP4
I believe they ship to AU , but worth asking them ? It is also stainless 51mm slip on. Lextek is a common exhaust brand in the UK, that’s why it was at the top of my head but there is loads of other mufflers out there in similar dimensions as the Lextek YP4

The actual rear pipe for the rear cylinder has no restrictor inside , neither does the front portion. See the black box that is on the exhaust system under your fairings, that kills most of the noise (silencing) and there may be something else in there that restricts the flow of the bike a little bit to comply with some countries that require the bike to be less loud & restricted in some form. Cut the box in the middle there, and find some “Y” shape pipe to join “rear + front + exiting pipe” , now you have a free flow system, even welding is OK. Just make sure the rear engine cylinder pipe is detachable incase you want to remove the engine!

K&N is discontinued forever for carb models , however fear not, we actually send BMC Italy & D/A EU filters as a replacement and are more superior than K&N ever was for carb models. K&N still has filters for EFI 650 bikes but ofcourse they do not fit the 250cc . The jets are important yes , that’s why it was mandated to include them with the sale , we wouldn’t sell the filters without jets as more air = more fuel or the bike gets too lean.

As for coils , send me an email for a custom quote in the future as i may be able to get you Mitsubishi Japan ones or Hitachi Japan coils , if the bike is going to be subject to the track runs. NGK caps = trusted brand, you will be OK and recommended. I would not use OEM HT caps on the tracks, we don’t even sell the new ones.

Regulator = Very very important, send us an email and we may find you a monster shingden regulator , like this one below (but i will create the harness to plug & play on the 250cc) (ignore the 650 stator, just look at the galley that shows the regulator)