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maybe your silencer is dirty / blocked..is it a standard Yamaha one or an aftermarket? How many miles has the DT done?

that's a bit doge(em)y

Woah. This needs sorting quick. The engine to exhaust seal should be airtight. If not the bike will go massively lean. Hense the 3500rpm. Using the choke is correcting the mixture after a fashion. Seal the pipe up then check your air filter. That may be partially blocked but you will lose a little go as running lean gives more power. Problem being the cyl runs too hot and pistons melt, (yes litterally). So a slight trade off is needed. If you keep running with the loose exhaust you WILL BLOW THE MOTOR. Costing at least a rebore.

Hi there To adjust idle rpm there should be a thumb screw turn it out anticlockwise slow until desired rpm reached! Speedo isn't working could be 3 things-cable snapped (most likely) speedo is broken or broken speedo drive (on front spindle) you need to get the front wheel jacked up disconnect cable by the clock end spin front wheel by hand and see if the cable inside is turning! As for the exhaust sounds a little strange, your saying the when its loose the bike runs better??? Either the exhaust system is blocked/coked up or there is a restriction in the chamber still. Hope this helps Ken

I'm really not an expert in this area, but from my own experience when i jumped on a bike for the first time: - it could happen if you're releasing the clutch really fast - jumping on the throttle hard when you're still releasing the clutch I hate shoddy gear changes in cars, so once I picked up my bike I spent some time really practising and getting to know the bike so my changes were smooth. If you think it's down to technique, I'd suggest some conscious practising - experimenting with how far you pull in the clutch and when you get back on the throttle etc. sure you'll soon find a happy medium for you and your bike.

Nice.