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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: kris on October 07, 2015, 09:36:10 AM

Title: Lower Throttle Bodies/ Lower Intake Manifold Rubbers
Post by: kris on October 07, 2015, 09:36:10 AM

Hi folks,
Whatever you call these thingys...they are the rubbers that bolt to the block below the fuel rail. My question: how prone to failure/ cracking are these units on a 29 year old brick? Is it a given that they should be replaced in time, much as the above-rail rubbers should be? I've done my uppers but haven't tested the system integrity on the lowers.

Thanks in advance!

Title: Re: Lower Throttle Bodies/ Lower Intake Manifold Rubbers
Post by: Scott_ on October 07, 2015, 06:11:17 PM

All you can do is to spray test them for leaks, that might give you an idea.
Eventually I do believe that you will need to replace them at some point and time.

I think I have replaced a couple of mine, as well as all of the rubber bits above and below them.

Title: Re: Lower Throttle Bodies/ Lower Intake Manifold Rubbers
Post by: kris on October 07, 2015, 10:23:19 PM

Thanks Scott. I suspected as much. I guess my brick will constantly have me spending money on one thing or another! That's what old bikes do! A set of rubbers comes in at around $240 all in. Then it would probably be wise to have the injectors cleaned, new o-rings, etc.. Do these injectors really need cleaning at 65K miles? My Sienna has about 150K miles on her and those have never been cleaned...maybe they should be.

Thanks again.

Title: Re: Lower Throttle Bodies/ Lower Intake Manifold Rubbers
Post by: Scott_ on October 07, 2015, 11:32:07 PM

I've yet to have my injectors professionally done.
I use Seafoam in the fuel tank 2-3x per riding season and I can't say as I have had any injector related issues.

I've got 108K on my '95 and 50K on my '97.

Title: Re: Lower Throttle Bodies/ Lower Intake Manifold Rubbers
Post by: kris on October 08, 2015, 07:23:29 AM

I've read somewhere that additives don't actually "clean" injectors. They have to be cleaned ultrasonically....not sure where the truth lies on this matter. I guess Mr. Injector does a booming business for that reason/ thinking.