RZ 350 jetting recommendations for Spec II pipe

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mtvnuccio
Posts: 6
Joined: Wed Oct 26, 2016 10:07 am

RZ 350 jetting recommendations for Spec II pipe

#1 Post by mtvnuccio » Fri Nov 18, 2016 11:01 am

Not sure if the jetting is in the ball park or not, im not sure if the bike is jetted for the pipes or stock

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motosapien
Posts: 396
Joined: Tue Aug 26, 2014 2:27 am
Location: Scottsdale, Arizona

Re: RZ 350 jetting recommendations for Spec II pipe

#2 Post by motosapien » Fri Nov 18, 2016 11:30 am

please post all engine related questions in Engine section

Thanks
2>4

hondaror
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Location: Alberta, Canada

Re: RZ 350 jetting recommendations for Spec II pipe

#3 Post by hondaror » Fri Nov 18, 2016 12:34 pm

Where are you located, what altitude, what's done to the bike? We need to know this stuff to get you in the ball park.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

mtvnuccio
Posts: 6
Joined: Wed Oct 26, 2016 10:07 am

Re: RZ 350 jetting recommendations for Spec II pipe

#4 Post by mtvnuccio » Sat Nov 19, 2016 2:21 pm

1000 ft above sea level( Atlanta area), stock air filter... that's about it

driftmaster
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Location: Little Rock, Arkansas USA

Re: RZ 350 jetting recommendations for Spec II pipe

#5 Post by driftmaster » Sat Nov 19, 2016 9:43 pm

I was told to get a stage 3 jet kit with needles. Helped tremendously on my bike.

madgoat
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Joined: Thu Oct 20, 2016 3:10 am

Re: RZ 350 jetting recommendations for Spec II pipe

#6 Post by madgoat » Wed Mar 14, 2018 3:28 am

250 or 260 jets should work fine with your set up.

Just keep the stock air box and all baffles in place and that is as much jet size increase you will need.

No change necessary to the needles.

garcenw
Posts: 80
Joined: Tue Nov 17, 2015 12:44 am

Re: RZ 350 jetting recommendations for Spec II pipe

#7 Post by garcenw » Fri Mar 16, 2018 11:12 pm

I'm just above sea level living just outside Washington, DC. My 1984 US bike has some vintage of Spec II pipes on it, but I don't know which ones. A pic of my bike is linked below, so perhaps you can see if your pipes match mine.

https://www.dropbox.com/home/Public/RZ3 ... t+side.jpg

I have the stock airbox and baffles and use a UNI foam filter. My motor is stock. With the stock jetting, it was rideable but would bog a bit here and there. I went to a 22.5 pilot jet and one size up on the main jet (I just don't remember if one size up was a 230 or 240 jet). Those changes made made the bike run superbly. If you haven't already also check float heights, carb syncing, etc., you should. The last thing I did was tweak the air screws for that last little bit of improvement in running quality. With a very long screw driver, I was able to adjust the air screws on the roadside.

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