Hitachi Carbs

I currently live in the Philippines where anything over 200cc is considered a "big" bike. I need to re-jet my carbs but I face an enormous problem. 1st the "mechanics" here have no formal training on big bikes, therefore it's a hit and miss situation, and the lack of parts for big bikes adds to the mix.

I need four #110 main jets and four #40 pilot jets along with the main jet spacers.

Should I add +2 to the mains being at sea level and running 2 into 1 open pipes? or should I be subtracting?

Your help is appreciated in this....thanks

 

here is a link to the xj4ever catalog run by len chacal...scroll down until you see the carburetor section and you'll see plenty of information on rejetting with some formulas and examples. http://xjbikes.com/Forums/viewtopic/t=14561.html
good luck

 

also, if you're taking them apart to rejet...why not clean'em as well. this is probably the best carb cleaning guide you'll find on the internet. compliments of rickomatic http://xjbikes.com/Forums/viewtopic/t=2 ... n+own.html

 

You don't say what bike you're asking about. That doesn't help things.

I would have guessed it's an XJ400, since you said "2 into 1 pipes"? But then you wouldn't need four jets... so I really have no idea.

Stock jetting is based on being at sea level, with stock airbox, and stock exhaust. Sounds like you're only difference is maybe the exhaust. Is it a a Supertrapp, or a Kerker, or just a generic header?

You may still find correct jets locally. A 200cc single is going to have a similarly-sized single carburetor to those in a 400 twin or a 750-4.