van avery

Is it wet from oil or Gas ? If it's gas make sure the carb vent line of the that carb is open. I had one that sprung a gas leak out the pilot jet air intake because the pressure inside the carb would not let the float lift and stop the gas flow. If you remove the air filter and run the bike a few minutes you will have a small gas "spring" out the top of the carb. Good luck

Hope this helps not sure what you really need.

Believe I'd put the bad cylinder at top dead center and install the compression tester hose ( assuming it has quick disconnect) and then hook up air compressor and see if the valves are leaking. You should be able to feel the air coming out the carb or the exhaust. Might need to adjust valves if the shims make it to tight , you can check the clearance with feeler gauges see the service manual for how. Or You might have bent valve which I had on an 88 Royale. You can replace the head in the bike. Good Luck

https://labs.trunkful.com/vrmanuals/index.cfm Try this link for thee manuals.

If someone installed a earlier aftermarket TCI on it might not have been set up for the Vacuum advance system to work and may have been disconnected/plugged. If memory is correct the early one were programed for the timing advance according to the RPMs.

Here is a note on Rotella T4 15W-40 oil for diesel. I've use it for quite awhile . I get it a SAM's club. Lots of different opinions out there. https://www.venturerider.org/forum/showthread.php?140886-OIL-CHANGE-(89VR)-Rotella-T4-15W-40-STUNNING-RESULTS!!!&highlight=rotella

Sound like your TCI is OK. Backfire is most likely carbs. You might just run a tank or two of gas with about 1/2 can of Seafoam and ride it like you stole it. Make sure you use the correct type of oil for wet clutch, no friction fighters etc. otherwise clutch will start slipping under hard acceleration in 4 and 5 th gears.

Here is some good reading and information. https://www.venturerider.org/forum/showthread.php?109965-Get-her-up-on-the-stand&highlight=footrest I picked up an 83 a few years back. Due a compression check with some oil a lot of times the valve will need adjustment, and the diaphragms on the carbs may need replacement. When you replace the valve cover gaskets get some for a gen II bike they are a bit easer to install and fit fine. If it is slow turning over you will want a Gen II starter and clean the ground wire to motor connection ( front right corner of motor below battery) . May need a newer TCI from ignitech@ignitech.cz its now a plug and play, original is mounted under battery upside down. Wires from stator tend to leak oil on the left side. I found "rapid fix" good for the plastic repairs, the two component type, not the UV stuff. Welcome to the site and good luck with your new toy.

Saw this on craigslist and thought you might be interested. https://houston.craigslist.org/mcy/d/houston-1983-mk1-yamaha-venture-royale/6949255887.html

If your interested in a 83 parts bike for free you just have to come get it. Send me a PM. I live a little SW of Houston. I've robbed several things including some valve shims and the engine is out of the bike but most of it is still there. She was a burgundy /red bike. I'm still supporting and driving my 87.

When your testing the fuses if you have an old headlight use it on the load side of the fuses. Sometimes a VOM will show 12Volt but when you add a load the main fuse will not carry the load. Had a Goldwing that drove me nuts. Had 12Volt until I hit starter then went to zero. The other thing I would do ….. is make sure your in Neutral , put bike up on center stand, and connect jumper to starter terminal and touch the other end to the positive terminal monetarily . That will bypass kill switch, solenoid, fuses and starter button etc. Won't check the ground side. Should tell you if the starter is good. If you find the starter is bad then you should get a 4 brush starter off a 2nd gen makes a big difference. Good luck and welcome to the group

Don't know if the bike has been sitting up awhile but check the carb vent lines. IF they are not venting correctly the trapped air pressure will force the gas out the top of the primary jet air intake hole.

done

http://www.venturerider.org/forum/showthread.php?131720-I-don-t-think-this-is-supposed-to-happen&highlight=vent+hose Here is another article on that problem. You might still have a stuck float

The vents hoses are the 4 black hoses off the top of the carbs, you don't need to remove the carbs. Take the air box off and these are the four black hoses going toward the back of the bikes. They go over the frame and are open ended down in front of the rear tire. Hope that solves the problem.