I didn't even own a bike in South Africa 9 years ago so all I know about bikes has been through Thai mechanics in Ratchaburi province. I've heard about DBS exhausts. DBS is an abbreviation of the Thai engineer who makes them or designs them. Daeng Bang Sai.
I heard a DBS exhaust for an NSR goes for around 1000THB, so cheaper than the online quotes for TYGA at 128 dollars for the steel version.
I have not yet ordered one because I want to fix my RC valve first. I am delayed because I do not have a friend or know a mechanic who owns an NSR150. I need another bike to check the components of my broken RC valve. I have the CDI and the valve motor servo at my house. I don't know which component is broken. At this time I am riding my bike with the valve mechanism tied half cocked with wire. So my bike has neither low end grunt nor top end power band. It still gets to 150 km per hour with ease, so I have a good feeling about this bike. Everything feels solid and sound on my bike and I got (not with my own hands) seals and bearings changed. I have to fix this problem before I upgrade my exhaust. (I made a mistake with my Honda XL250 degree - which i inherited broken from a friend leaving Thailand. I invested in new handle bars, rubber, chain sprockets, clutch and paint job but the valve job the mechanic did lasted 1 month before the valves were bust again. Now I need a new engine for it. But I don't even want to bother with four strokes any more. I think when a four stroke is bust it's just bust, even after 50 grand invested in fixing it.)
Your stable makes my mouth water. Do you want to let go of one of those NSR250's?
I want to sell my broken down XL 250. It needs a new engine is my opinion, but the electrics and other engine accessories are new and sound. I'd let it go for like 15k. New engine would be around 11k.
If you are a two-stroke collector, why not invest in a CRM? It's an awesome crosser. I always wanted a CR500 but now I am more keen on road bikes. I am a sh*t mud and sand rider and they are wobbly at speeds over 140, but damn do they get to 140 fast. In one drag race i totally creamed my friends NSR150, and CBR400 back in the day.
Back to the exhausts. Mechanics have recommended DBS, PTS and DBK - which i think is a knock off of DBS. Online the names seem to be TYGA, Arrow and Dog Fighter, but not in Thailand. Although TYGA is made in Thailand.
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Thailand NSR150 owner, NSR250 wannabe owner after I learn the basics of my cheap-assed bike.