Help with 78 special bs38 carbs please advise needed.

[Mlourigan83]

Pic 0353 above, is where the engine numbers should show, to the left on that flat behind the lower motor mount.
That motor shows no engine serial number that I see.
Out of curiosity, what shape is the left, front valve cover? Answer should be semi rectangular or round like the right front valve cover.

Yeah to my research I was also surprised to see no serial number there and then I found that some bikes has a number located behind the oil delivery tube and so that’s why I included that pic also. I will look at the valve cover in the morning.

 

[Mlourigan83]

Well, you do have the '78 type cam chain adjuster so I'm going to guess someone just changed out that right engine cover.

What you're describing (hard braking causing a stall) is often related to the float levels. In this case, they may be too low.

Ok thanks very much I will make sure to set the float levels I did not adjust them when taking the carbs apart. I definitely appreciate the advice. I can keep the bike going if I make sure to stay on the throttle so hopefully this is it.

 

[gggGary]

Bird chirping noise on BS38 carbs is usually traced to a loose choke housing or the choke housing gasket being damaged. Both carbs have this housing. Another motor staller is a misfire, points type ignitions in less than stellar condition are more prone to an ocasional misfire.

 

[650Skull]

https://www.xs650.com/threads/xs650...workshop-manuals-and-other-information.30569/

The number behind the oil delivery tube is a head and rocker cover matching #, they are in place when the holes are machined in the head/cover. Using mismatched head/cover's will cause the seal to leak due to misalignment

Cases are matched as well