Hi thanks for letting me join group

[Markangels4]

Hi can I ask for help I’ve built a hardtail chop using an old xs650 1979 I found the engine and carbs are all in bike now , I’m trying to tune it but having trouble it seems to get hot quickly, slightly spitting back through exhausts too on closer inspection it has mikuni 34 carbs but 150 main jets and 130 pilot air jets in it it’s running after market exhaust and cone air filters, your help would be appreciated and thanks in advance

 

[Markangels4]

Sorry to mention it has new coils , ht leads , caps , plugs , condenser, new battery and points

 

[gggGary]

Hey Mark, pictures of bike and carbs?

 

[gggGary]

Take off the cone air filters how does it run then?
Many cheap cone pods are worse than useless, blocking off important air ports on the intake bell.

 

[gggGary]

Have you checked timing both idle and up past 3K RPM with a timing light, also looking for smooth advance.

 

[Markangels4]

Hey Mark, pictures of bike and carbs?

I’m at work at moment but will do asap just to say it runs exactly the same with out filters I will heck timing though thanks

 

[Markangels4]

Hey Mark, pictures of bike and carbs?

 

[jpdevol]

On newly assembled bikes - with your symptoms particularly - I'm a fan of verifying cam timing and ignition timing first, before messing with the carbs. I'll stick with that, but there are a couple of carb issues worth mentioning:

They appear to be BS34's that would be std. on '80 & later XS's, but they're installed right on left and left on right (should have a fuel inlet T in between).

A 150 main jet is way large - most bikes (even with those pipes & filters) would max at a 145 and I think you might need a 140 (depending on the needle). The pilot should be ~ #45 and they take a rubber plug covering their nozzle or don't work right. All the jets need verified in that set-up

Given the above, I might go back through the carb install first and put things closer to OEM - then check the timing

 

[gggGary]

BS34's that would be std. on '80 & later XS's, but they're installed right on left and left on right

Those are euro spec BS34's..... carry on JP!

 

[Markangels4]

On newly assembled bikes - with your symptoms particularly - I'm a fan of verifying cam timing and ignition timing first, before messing with the carbs. I'll stick with that, but there are a couple of carb issues worth mentioning:

They appear to be BS34's that would be std. on '80 & later XS's, but they're installed right on left and left on right (should have a fuel inlet T in between).

A 150 main jet is way large - most bikes (even with those pipes & filters) would max at a 145 and I think you might need a 140 (depending on the needle). The pilot should be ~ #45 and they take a rubber plug covering their nozzle or don't work right. All the jets need verified in that set-up

Given the above, I might go back through the carb install first and put things closer to OEM - then check the timing

Thank you for your help

 

[Markangels4]

Thank you for your help

 

[Markangels4]

Here’s a picture off them off bike definitely got a 150 main jet

 

[Moturcyclenut]

Make sure the condensers are grounded. If they aren't it can create troubles of running hot.

 

[Markangels4]

Hi guys , just an update if you’re interested, I grounded my condenser, set cam , valves, points and timing , bike sounds better slight back firing through left exhaust but right has stopped lol , carbs are going to get a good stop down and reset so hopefully will sought thanks for all your help

 

[jpdevol]

Given your intake and exhaust - and all else being correct - I'm guessing your jetting - with 51X11 needle in the middle clip position - should be a #45 pilot jet, fuel screw @ 1 1/2 turns and a 137.5 main jet

 

[Markangels4]

Given your intake and exhaust - and all else being correct - I'm guessing your jetting - with 51X11 needle in the middle clip position - should be a #45 pilot jet, fuel screw @ 1 1/2 turns and a 137.5 main jet

 

[Markangels4]

Thanks buddy I will keep you updated

 

[Kevin Werner]

Hi can I ask for help I’ve built a hardtail chop using an old xs650 1979 I found the engine and carbs are all in bike now , I’m trying to tune it but having trouble it seems to get hot quickly, slightly spitting back through exhausts too on closer inspection it has mikuni 34 carbs but 150 main jets and 130 pilot air jets in it it’s running after market exhaust and cone air filters, your help would be appreciated and thanks in advance

You have the very best XS650 friends here. Welcome to the madness.

 

[Markangels4]

Hi can I ask for help I’ve built a hardtail chop using an old xs650 1979 I found the engine and carbs are all in bike now , I’m trying to tune it but having trouble it seems to get hot quickly, slightly spitting back through exhausts too on closer inspection it has mikuni 34 carbs but 150 main jets and 130 pilot air jets in it it’s running after market exhaust and cone air filters, your help would be appreciated and thanks in advance

Just wanted to show you guys the carbs now all cleaned and set up and running good, thanks for your help