VintageVmax.com

Ok thank you! The coating is flaking off in chunks, i unhooked it for now.

Finally getting it all running right. rebuilt engine with wisecos and cast bore 20 over, recond. crank complete water pump/ gearcase overhaul, 17 top gear P 85 primary with light blue spring and 10 mb weights engages around 4300 pulls around 8000 i think it was dark couldnt see rpm that well. aaeen ...

On top of the airbox is what appears to be a porcelain or ceramic block with 2 wires going to it, Is this for handle bar heaters .

probably a faulty thermostat! just remove it and make sure you warm up the engine before you drive it hard 3 to 5 mnutes, and check the antifreeze with a tester to make sure the mixture is right. Its the water that cools the engine not the antifreeze. Too much antifreeze and not enough water will ma...

i,m wondering if maybe a float has a hole in it ? Or the float pins in the carbs some times need a good cleaning, The pin holes in the floats get gummed up i use a piece of wire to kinda scrape them out . Just a thought! And make sure the fuel pump is put together correctly just in case there was a ...

theres 2 fuel pumps you rebuilt both ??

i have the same problem no light so i got a battery and some wire and a switch and now run a really bright headlight that never gets bright or dims and have so far about 4 hrs continuous on one charge and more possible . LOL i just wanted to ride and stuff was available so we made it work and its re...

had the same thing happen to mine and the fuel pump diaphram had a hole in it and the gas drains into the bottom end of the motor. Mine was on one side and one pipe filled with fuel. I rebuilt both fuel pumps since and all is good fuel wise.

You may have a rebuilt crank hard to say .

i just use 2 stroke oil of good quality and keep it topped up regularly, there was antifreeze in the case when i took it apart from the leaking water pump seal. it was milky brown colour.

Since the engine is out of the sled a consideration about reliability would be the gearcase assembly, Mine had 7000 miles on it and my case needed work all new bearings and seals were replaced. There was alot of wear believe me!!! If you look in the MY PROJECT section look for 1985 vmax and look at ...

I,m thinking the gearcase is bound up .

try the yamaha dealer or an aftermarket place

How bad is it flooding, is there gas coming out of the pipes . If your engine is filling up with fuel then you need to rebuild your fuel pumps most of the older sleds should get diaphragm kits changed. There just thin plastic discs and do wear out or deterioate.

I would also clean the pilot jets in both carburetors the holes are tiny and when they plug up your sled will run but only after 1/3 throttle like 3000 to 3500 . It will run lean at low rpm but not bad once in the midrange.