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brianb wrote:can someone tell me what size carbs came stock on the 660cc scorpion and help me understand why the one cylinder has two carbs ? different throttle levels kicks in secondary? anyway tring to find best carbs bike is basically stock except muffler off 2000 yamaha 450cc quad please help thx
Brian Burns
ralf wrote:I think the Skorpion carburettor is called YDIS, Yamaha Dual Intake System. I thought it troublesome until I got the primary carb jetted right. Try a 55 pilot jet and 21/2 turns open on the mixture screw, it worked for me! Use an appropriate size (check the maintenance manual but maybe 6mm?) drill shank under the primary carb throttle body to set the critical opening position of the secondary carburettor.
Mine now works beautifully, no hesitation, smooth performance throughout the range. My 500R has a Dellorto pumper carburettor, yes it's much simpler but my Skorpion is much smoother. Persevere with the YDIS before you bin it.
Ashtabula63 wrote:Brian,
Did you get your carb changed out? And if so, what did you end up buying? I think I need to do something similar and need all the advice I can get.
thanks,
Wes
breakwellmz wrote:You may well have seen this -
buckscreek wrote:breakwellmz wrote:You may well have seen this -
I've seen and am using a similar drawing, sourced from another MuZ owner here is Australia, who probably received it from someone in Europe. My machinist called last night, he has completed the work on the main flat plate (as shown on your drawing), he's going to mill the face off a Grizzly 660 intake manifold today, ready for welding to the plate. We'll have some further internal machining/cleaning up to do to ensure we get as smooth a flow of fuel/air mix as we can from the end product. I'll post some photos when I have all the bits together, ready to install.
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