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Old 03-14-2015, 11:26 AM   #21
blensen
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Hanging idle usually means carbs out of sync or lean on the idle circuit. Try it again with the airbox on it.
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Old 03-14-2015, 11:29 AM   #22
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Carb sync. Could have vacuum leak on carb slide tops/diaphragms, but I'm putting my money on carb sync.
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Old 03-14-2015, 11:56 AM   #23
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I was going to suggest a vacuum leak.
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Old 03-15-2015, 09:17 AM   #24
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Crabs have been synch and Jets are the right ones for the after market exhaust, I think it's just the air/fuel I went from three turns to two in a half and the hanging higher idle is typically when it's running lean... Or at least that's what my research has found
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Old 03-15-2015, 09:26 AM   #25
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you have synchronized crabs?!?
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Old 03-15-2015, 09:29 AM   #26
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seriously, I know it's a pain but resynch may help. On the other hand it could be as simple as throttle cable routing.
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Old 03-15-2015, 10:56 PM   #27
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ya I feel dumb I thought you guys meant sych the float bowls ... ugh well, any one have or know some one who has a carb synch gauge I can borrow ?
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Old 03-15-2015, 11:19 PM   #28
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how Ironic I found this video and it was the same bike
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Old 03-16-2015, 08:34 AM   #29
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When you synch the carbs be ready to start adjusting the idle lower. It will climb as the synch gets closer to correct.
Also be ready for your bike to run great, lol. It can make a big difference depending on how far out it is.
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Old 03-18-2015, 05:26 AM   #30
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Alright got it back to 3 turns out on the air fuel mix screw, the hanging idle is gone but now the sucking/ bogging at the very begging has become worse... any other suggestions

https://www.youtube.com/watch?v=bhM9...ature=youtu.be
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Old 03-18-2015, 06:08 AM   #31
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The FZR400s were well known for that flat spot right off idle. I had one re-jetted and it got moved to around 5500rpm but it never went away. I had the same rough spot on my third one and after running a couple Techron/gas through it, it cleared up.
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Old 03-18-2015, 08:25 AM   #32
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I'll bet that stumble improves a lot when you put the airbox back on.
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Old 03-18-2015, 12:03 PM   #33
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I'll give it a shot once I sync them
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Old 03-18-2015, 01:08 PM   #34
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Quote:
Originally Posted by Jenk's View Post
I'll give it a shot once I sync them
I would do the sync with airbox on too. For whatever reason they're pretty sensitive to having it in place. My old FZR600 wouldn't rev cleanly and did a pretty similar stumble when I took the box off. You should still be able to reach the sync screws as long as the fuel tank is removed.
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Old 03-30-2015, 05:11 PM   #35
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Officially up for sale :(
http://www.motohouston.com/forums/sh...d.php?t=308292
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Old 05-15-2015, 07:32 PM   #36
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Let me know when you are selling. I am partial to the smaller yamahas.
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Old 05-17-2015, 01:46 PM   #37
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Thanks for reply. Sorry you put it on Ebay. Was hoping to talk with you before that. Again let me know if they flake out.
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Old 06-05-2015, 09:00 PM   #38
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Hope you are enjoying your trip. Say hello to the fiancee. Thanks for the bike, have always wanted one. Synced carbs and runs a better but still stalls after hot. Great bike though. You were right about being loud. After getting RZ back together for COTA will take some time to get tires, work on carbs, and update the suspension. Be nice if the RZ engine would transplant but it looks physically impossible. But I have seen the impossible done.
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Old 06-05-2015, 09:06 PM   #39
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Hope vacation is going well. Say hello to your fiancee. Synced the carbs and runs better but still stalls at idle when hot. Always wanted the 400 and it is what I hoped it would be and my it is loud. Sounds bad on the downshifts. After getting the RZ ready for COTA i will update the tires and suspension. Wish I could squeeze my 500 engine in the frame. Again thanks for a fun bike.and hope to see you at the track when back.
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Old 08-28-2015, 01:03 PM   #40
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Your Welcome! And ya it was a great time, Ill be at all the upcoming ridesmart events so just come find me
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