Leaking from the overflow tubes mean either the float is sticking open or the float level is set too high
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Bike bogging/sputtering on throttle
- Thread starter amaro_j07
- Start date
These are the carbs
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Look like 76/77 model year BS38?
Yes I believe they're bs38, you're the 2nd person to say the same
Now you need to open them up to see what's inside. Every two years the set up changed. The year is very important. Some parts from different years can fit but are incorrect. Really have to go into fine detail with them.
To add - don't buy carburettor overhaul kits. They're full of incorrect parts.
That's the plan and i also need to order a rebuild kit . Once I have it opened up I will post pictures of the insides
Don't buy rebuild kits.
Post here and members will tell you what to buy. You really need to download the excellent carburettor guide pdf from this website too.
Here's a section from the carb guide I mentioned above. See all the different set ups? We need to see inside those carbs and take it from there.
I believe those are BS38 before 1978.
On the left side of the engine remove the round cover behind the shifter and post a photo. Also under the points cover, top middle.
Looks like single cable, so 76/77 I reckon.
Cool I will do that this afternoon and will get back to you guys with pictures
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A carb rebuild is just 99% a thorough cleaning. No need to replace any parts that are still good. The original float bowl gaskets are very robust and can usually be re-used. Yours look original and still good. About the only thing that will probably need replacing is the o-ring on the needle jet. Check the jet to see if it's a tight fit in the carb body. If it is then you may be able to leave it be. If it's loose then the o-ring has perished.
The only thing I see off with your carb set is that the external float bowl vents are connected together with a hose. They shouldn't be, they should just vent to atmosphere. That may be your whole problem right there. A vacuum may be forming in the bowls and that would stop the fuel flow.
The only thing I see off with your carb set is that the external float bowl vents are connected together with a hose. They shouldn't be, they should just vent to atmosphere. That may be your whole problem right there. A vacuum may be forming in the bowls and that would stop the fuel flow.
Awesome now I know what to look for and yes mine are connected together I will be disconnecting them let them loose individually
You don't need the little vent hoses as shown in my 2nd pic, you can just leave the nipples open.
That shouldn't hurt anything as long as the floats aren't leaking (filling with fuel). Take them off and shake them to see if there's any gas inside. Then you can test them for leaks by dipping them into a tub of hot water. Any leaks will show as streams of air bubbles coming out of the float.
Awesome will do thanks!
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