So you think it's most likely the carb that's my problem?
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Running rough
- Thread starter crybinsk
- Start date
Well, I can't say with 100% accuracy, but from what you've told us so far, it's a very good possibility, lol, especially if the P.O. installed a '73 rebuild kit. You can check the jetting by just dropping a float bowl, carbs still mounted, using a stubby screwdriver. That will tell you whether or not you need to go further. Both the main and pilot jets mount in the bowl on the BS38s. The main is under the drain plug on the bottom and the pilot is installed from the top .....
The needle can be accessed by removing one of the carb tops and lifting the slide/diaphragm assembly out of it, carbs still in place.
You said you wanted to learn how to wrench, well, the 650 can be a very good teacher, lol.
The needle can be accessed by removing one of the carb tops and lifting the slide/diaphragm assembly out of it, carbs still in place.
You said you wanted to learn how to wrench, well, the 650 can be a very good teacher, lol.
Here is the carb underneath
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So I think you are correct it's the 77 carb on the xs1 engine. He said all carb sets are aftermarket and he bought it for a 73 xs650. So I'd assume it's the wrong one. I'll try and take the entire carb off tomorrow evening when I get home. As for learning. I am learning a lot. Just thought I'd be able to get a safety and drive it a bit before I started learning. Lol. Just hope in my lack of knowledge I didn't buy a complete piece of junk that won't work. If it can be fixed there is hope.
Sorry I'll try and take the bottom bowl off tomorrow. I'll send you some pics. Thanks for all your help so far
OK, that looks like a '76-'77 bowl but ...... it might be even older. A little 650 carb history for you - the 650 carbs used two different types of pilot jets over the years. They will interchange but you can't do that because they flow differently and the bowls differ in how the air is delivered to the jet ......
Your '76-'77 carb set was made to use the VM22/210 type pilot jet and should have a bowl that looks like the one on the left above. But, if the P.O. installed a '73 rebuild kit, that carb uses the other type of pilot jet, the BS30/96. If the guy installed them in a VM22/210 bowl, they won't work right. But if he was aware of the two bowl types (doubtful, lol), he may have swapped on a BS30/96 type bowl to go along with the BS30/96 pilots that came in the '73 rebuild kit. So, you really need to take a bowl off at least and see what type it is, and what type of pilot jet is installed in it.
Your '76-'77 carb set was made to use the VM22/210 type pilot jet and should have a bowl that looks like the one on the left above. But, if the P.O. installed a '73 rebuild kit, that carb uses the other type of pilot jet, the BS30/96. If the guy installed them in a VM22/210 bowl, they won't work right. But if he was aware of the two bowl types (doubtful, lol), he may have swapped on a BS30/96 type bowl to go along with the BS30/96 pilots that came in the '73 rebuild kit. So, you really need to take a bowl off at least and see what type it is, and what type of pilot jet is installed in it.
Hmm. Could be a 76/77 set of carbs with earlier float bowls? Need to see the inside of those float bowls to be sure.
Looks to be a Pamco clone.
Also.... LH exhaust valve cover is an XS2/TX cover. Makes it a good possibility that's an '72-'73 motor. Give us the serial number stamped on the front of the motor and we can figure out what year it actually is. Look under the front engine mount.
Also... header on that LH side looks like it isn't installed correctly. Aftermarket?
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Also... top end studs have an extra (lock) washer. Should be just the one with the oil seal molded in. Most people replace 'em with copper or brass washers. So.... add that to your list of stuff to fix.
It's aftermarket, so all bets are off, but it doesn't look like they fit inside the exhaust port... looks like they're just butted up against 'em.
It's a '72 XS2...
It's a '72 XS2...
Yes, you're running pretty rich, lol. That would happen if the P.O. installed the jets in that '73 kit, and especially if he installed the needle. That kit most likely came with a generic Y-22 needle, a copy of the 4JN19 that came in the '70-'73 carbs. The problem with it is it's much too short, nearly 5mm shorter than the 4M1 that should be in your carbs.
I agree with you. Everything is pointing to the carb and that it is not set properly. I'm taking it off soon and get back to you with pictures. I'll start with just removing the bowl while on the bike so you can see. Then I'll take it all down if what you think is correct
Big difference 'tween the two.... '72 XS2 was the first year with electric start. That installed on yours?
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