I've been through hell to find some real stock settings and information about the SR 400's stock carburetor BST34 Mikuni. You might be wandering what the hell i am talking about. Alright let's be clear, SR is a famous bike, SR500 and SR400 is pretty famous but search the web by your self if you can find information like Stock Pilot Jet Size, Stock Main Jet Size etc of the SR 400's that came between 1988 - 2000. The stock carburetor is BST34 Mikuni diaphragm CV Carburetor. i am sure it won't be easy because SR 400's are rare outside japan and asia, most of the documents including user manual etc is in complete Japanese. That is not the only reason, nearly 90% of the SR4's out there are not running on stock carbs. They are running on alternative slide carbs from many other manufacturers.
So i thought i will share the information i found out about the settings with everybody who search for it. after setting my bikes carburetor to these stock specifications, it started giving more power, and the problem it had of the RPM is going up and down on it's own in idle has solved. So here goes. If you want any other information please do not hesitate to ask, i'll be happy to help.
VM32SS Slide Carburetor (Model Years 1978 ~ 1987)
Main Jet - # 280
Pilot Jet - # 25
BST34 Mikuni CV Type carburetor (Model Years 1987 ~ 2000)
Main Jet - #162.5
Pilot Jet - #45
Float Height Settings - 12.5mm ~ 13.5mm
Idling Speed - 1350r/min
BSR33 Mikuni CV Type Carburetore (Model years 2001 ~ ????)
Main Jet - #162.5
Pilot Jet - #22.5
Float Height Settings - 14mm ~ 15mm
Idling Speed - 1200r/min ~ 1400r/min
I couldn't have found these settings without the help of "Madmax", an esteemed SR elder from the SR500forum. He deserves all the credits about me finding out above information.
No comments:
Post a Comment