Originally Posted by
revo7617
Hy Ron, thanks for your reply.
First of all, excuse my english, Im from Mexico, LOL, so Ill try to explain myself as clear as I can.
I found that the "carb Adjuster" is called the Carb Retainer, with O-Rings on both sides. One of those came broken, like a "C" shape. I just put another one, and fits a little tight, but nothig to worry about.
The second Issue is the carb not sitting flush to the block of the engine. Between the oring and the block, there's like 4mm. I pushed hard enough to the point my finger had marks of the restrictor.
Having that problem, I decided to open the box of my other new B5, to check if the carbs had to be that apart from the block, and my surprise was that the 2nd engine and the carb sit perfect, so I checked the 1rst carb with the 2nd engine and sits perfect. So the problem was the first engine.
I put both carbs in the first engine and they don t fit right (4mm upper than they should be).
I checked both carbs and are exactly the same dimensions. The white insulation plastic is exactly in the same position, flush to the alloy material.
So, I decided to remove about 2mm of the white material in the end of it (like a cone) with a hobby knife, after that, the carb sits perfect in the 1rst engine.
Hope I was clear enough, LOL.
Hello Juan,
Thank you for clarifying things. The carb retainer also known as a carb pinch bolt has two o-rings on it, one on each end as you mentioned that fit into a groove machined into the two aluminum halves of the bolt. Then the part is bagged with the collet and exhaust gasket. Because the o-ring is not inside of anything there is no way for it to be held in place so it's obviously impossible for some one at the factory to take a broken o-ring and some how stick it around the pinch bolt half. If I was to take a guess I would think that possibly during shipping the edge of the collet rubbed against the o-ring nicking it.
Now regarding the issue that you described with the carb sitting flush I've given this some thought. First all of the cases are machined the same way and specifically the depth or cut for the carb base into the case is done in a single machine operation, meaning that if this was not done properly there simply would not be a hole there. After looking at things for a bit what I think happened in your case is that the o-ring at the bottom of the carb base opening which sits in a groove machined into the case was simply not fully seated which made it difficult for you to push the carb all the way down. If any of you ever see this issue just take a pencil or another soft blunt object and run it around the o-ring inside of the case. This will seat the o-ring in the groove it sits in and you should be good to go. Should not take more than 5 or 6 seconds to do this.
Regards,
Ron