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post #1 of 8 Old 10-26-2014, 2:06 PM Thread Starter
 
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cbr wont start

hi all im new to the site and just bought my first cbr, currently im trying to get it sorted and running again, ive cleaned the plugs and i get a spark, there seems to be fuel there but the plugs are black and have fuel around them, it used to missfire but now i cant get it started, and to top it off i went to adjust the mix screws and the 2 carbs in the middle have both got broken mix screws, all it will do is turn over and backfire, any help or advice would be highly appreciated
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post #2 of 8 Old 10-26-2014, 7:12 PM
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Re: cbr wont start

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Originally Posted by grant1985 View Post
hi all im new to the site and just bought my first cbr, currently im trying to get it sorted and running again, ive cleaned the plugs and i get a spark, there seems to be fuel there but the plugs are black and have fuel around them, it used to missfire but now i cant get it started, and to top it off i went to adjust the mix screws and the 2 carbs in the middle have both got broken mix screws, all it will do is turn over and backfire, any help or advice would be highly appreciated
What year, and what other history can you give us about it? Have you tried starter fluid to see if it runs? Replace all the mixture screws if that's the case.

RRV, got it from your other post..

My 99 900RR Track Build Link:Track Build 900RRX

My Red Rocker 93 Build Link: Café 900RRP

Last edited by IanDoohan; 10-26-2014 at 7:15 PM. Reason: Added RRV
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post #3 of 8 Old 10-27-2014, 12:38 AM Thread Starter
 
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Re: cbr wont start

I tried starter fluid but it fired and didnt start attempted again and it failed im thinking thr plugs are fooked but how can i change the mixture screws if the 2 middle carbs have the heads of screws snapped off?
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post #4 of 8 Old 10-27-2014, 1:14 AM
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Re: cbr wont start

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I tried starter fluid but it fired and didnt start attempted again and it failed im thinking thr plugs are fooked but how can i change the mixture screws if the 2 middle carbs have the heads of screws snapped off?
Seems like a fueling issue. As far as the screw heads being snapped off how can you tell? Have you had the carbs out? The fuel mixture screws for that model I believe are a solid core screw, meaning there is no real "head" to snap off. It would had to have broken at the taper part where the needle is. I say that because that would be he weakest part of the screw. The heads should not have any slots in them and should be D shaped requiring a special tool. However, in reality we all know that stranger things have happened and being a soft brass screw it's very possible that it snapped at the threads. They can be drilled out, very carefully. Any chance of posting a detailed pic of one or both?

My 99 900RR Track Build Link:Track Build 900RRX

My Red Rocker 93 Build Link: Café 900RRP
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post #5 of 8 Old 10-27-2014, 7:56 AM Thread Starter
 
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Re: cbr wont start

same crews as this pic so now i dont have the cross engraved anymore its just flat and nothing to grip on. both end carbs are set at 3 turns i clearly cant tell yet what the 2 middle ones are, if they are set at 3 turns then where would i look next to adjust to stop it running rich and hopefully it will help it to start.
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Re: cbr wont start

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Re: cbr wont start

the last link shows in the 1st image of what i mean. i couldnt upload a piccy for some reason
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post #8 of 8 Old 10-29-2014, 3:50 AM
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Re: cbr wont start

One of those broke for me too.. i just cut a line in it for a flat head using a dremel. Using 2.5 turns out btw.
Had same problem as you, the screws was at 3 3/4 turns. Also had to air out excessive gas by having the carbs out over night.

Ride safe!
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