yamaha tzr 50 with 21mm dellorto, big or normal jet?

[tzr50rossi]

Hello!

I have a Yamaha tzr 50 and i have bought me a new carburator a dellorto 21mm.

The original tzr 50 carburator is 16mm and i must have 120 jet for not get it overheated or damaged only with a leovince v6 exhaust.

How big jet do i need with a 21 dellorto carburator? it came with 92 main jet as standard.


Should i use the big jet as 120 like the original carburator or must i have more normal jets like a 85-95 jet?


The bike have no speed limits and it have leovince v6 exhaust, before its work fine with a 115 jet on original 16mm carburator..


I ask because im afraid to overheat or get damage to the cylindre if i not use big jets on the new dellorto 21mm?


Be whery happy for answers!

[bladerunner]

Start big and work down is the safe way to check jetting. I can't say what size main jet you need as I have never jetted the 21mm carb. A bigger carb will need a bigger jet .....however it's not just the main jet size that determines how much fuel your engine will get. Other things like emulsion tube and needle as well as air corrector jet all play a big part so if you can compare these with your 16mm carb then you can compare at least as a starting point.
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's