New motor fires up, on one cylinder
 

trying to figure out why. put in different coil and plug to no effect. Front cylinder exhaust gets hot rear does not..any ideas?

Fuel in carb?

You could take the air cleaner cover off and pour a cap full of fuel in the rear carb throat and see if it fires on that:eek1 or might be safer to pull the rear coil stick and stick another known good spark plug in it (making sure its earthed) and see if it sparks:D. Has to be fuel, spark or compression all working at the right time. Good luck.

Just read the title again, what do you mean "new motor" and I assume nothing else has changed, carbs, electrics, ignition.

Replacement motor. Original electrics that worked fine with the old motor. Old carbs as well. Gonna try dumpin fuel down the carb and see if that works

Did you check the valve clearances and/or verify that the cams are installed correctly? If the seller is considered trustworthy, then this shouldn't be a issue if they were selling a known good running engine. But generally a good idea to verify and establish a baseline of known settings.

Also, depending on how long the bike was apart for the engine transplant, the fuel may have fouled the jets or stuck the float. If there is no fuel in the float bowl, then the needle is stuck in the seat.

Verify you have spark in both cylinders, if so move along to fuel, compression, oxygen.............

Took the words out of my mouth.

Had a few minutes to mess with it today. Poured a little gas down the throat of the rear carb. Cranked it a bit and it coughed and fired on both cylinders. Gonna pull the carbs off and clean em up. Obviously some debris in the system that has it plugged up. It didnt sit long enough to gum up before I drained the Carbs.

it helps to run it with just the left tank on until you get it dialed , you can see what the carbs are doing and have access to them

Yup. Only have the left Safari tank on. New carb clamp came in today as well. ( old one stripped but its on the front carb with a different screw/nut making it work.

Carb? What's a carb????

Oh! You mean those old-fashioned things my great-grandfather's Edsel used to have to shoot gas into the pistons! :lol3

Doesn't shoot gas it drizzles it

Tossed some sea foam in the tank to see if it will clean the jets/carb up a bit. It's poppin a bit and doesn't want to run off choke.

Exactly, the ones that doesn't give you whiplashes from normal use...

:huh

/Zappa