Throttle Body Syncing - Chicagoland Sportbikes
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post #1 of 8 (permalink) Old 11-27-2013, 12:57 PM Thread Starter
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Throttle Body Syncing

Anybody have an opinion on syncing the throttle bodies in conjunction with a valve adjustment on CBRs? I came across several posts on CBRF recommending syncing when adjusting valves(and several others that say to just button it up after the valve adj.), but its not even mentioned in the shop manual. I'll be wrapping up the valve adjustment on my 02 F4i in the next couple days as soon as i track down the shims.

The bike has 30,500. As far as I know, it hasnt had its first valve inspection at the recommended 16k, but only 4 intakes were out of spec. All else, including the exhausts where dead on. I'll also be replacing the air filter and plugs while I'm in there anyway. I really dont want to spend the coin on a gauge I'll rarely use, but if I have to, nows the time I guess.

Oh, in case, the valves are being adjusted as par of the service interval, all else is just preventative. The bike runs like a champ with no vibration or performance issues.

Last edited by singram; 11-27-2013 at 01:00 PM.
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post #2 of 8 (permalink) Old 11-27-2013, 04:55 PM
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it only affects idle and off idle performance, I used to have carb stix, filled with mercury, occasionally it would spill or get sucked into the engine and i'm sure ive breathed it in the exhaust , if your bike idles smoothly chances are that it is fine
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post #3 of 8 (permalink) Old 11-27-2013, 04:55 PM
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its a much bigger deal on V twins than inline 4s
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post #4 of 8 (permalink) Old 11-27-2013, 05:18 PM Thread Starter
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Quote:
Originally Posted by elroy121 View Post
it only affects idle and off idle performance, I used to have carb stix, filled with mercury, occasionally it would spill or get sucked into the engine and i'm sure ive breathed it in the exhaust , if your bike idles smoothly chances are that it is fine
Yeah, thats sorta what I figured. Hey, thanks for the help, Dave.
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post #5 of 8 (permalink) Old 11-27-2013, 06:25 PM

 
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The vacuum is all related to compression.Unless you had an open valve checking the clearance has nothing to do with it.

I would suggest a good cleaning of the throttle bodies though.They may look like someone painted the insides with black paint.Clean that shit off with some juice and a rag.
look for any mess around the intake manifolds if there is any they maybe leaking.

Gus
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I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #6 of 8 (permalink) Old 11-27-2013, 08:38 PM
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TB Synch

You could leave it alone, if the bike idles fine once the motor is at normal operating temp. Or...adjust the TB's. Carbs take a little bit more work/time to synch (but you don't have to worry about this).
I would adjust the TB's if you can spare a few minutes and find a synch tool. It's extremely easy and you will get a smooth idle and instant throttle response.
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post #7 of 8 (permalink) Old 11-29-2013, 03:12 PM Thread Starter
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Quote:
Originally Posted by resurrection View Post
The vacuum is all related to compression.Unless you had an open valve checking the clearance has nothing to do with it.

I would suggest a good cleaning of the throttle bodies though.They may look like someone painted the insides with black paint.Clean that shit off with some juice and a rag.
look for any mess around the intake manifolds if there is any they maybe leaking.
Everything actually looks pretty clean, but I'll go over those couple things before I reassemble the TBs. Thanks, Gus.


Quote:
You could leave it alone, if the bike idles fine once the motor is at normal operating temp. Or...adjust the TB's. Carbs take a little bit more work/time to synch (but you don't have to worry about this).
I would adjust the TB's if you can spare a few minutes and find a synch tool. It's extremely easy and you will get a smooth idle and instant throttle response.
Point taken. The bike idles and runs VERY smooth actually. I'd love to do it if I had the gauges, but since I'd rather spend the $$ elsewhere on the bike I'll probably just leave it alone. Thanks.
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post #8 of 8 (permalink) Old 12-01-2013, 10:46 PM

 
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It can drive you nuts anyway.
best left to someone who has done it before and has the tools.

Merry Christmas.

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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