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Don't have a picture Tony but it isn't hard to explain. Two tank ports on the pump. The port directly below and closest to the bleeder screw is supply. It is also the port closest to the rear of the sled when engine is mounted. The other port is return to the tank. Supply line to the pump is the one...

Bob, as far as waterpumps go I guess the best ones are the ones that don't leak (lol). I think there was an update on them but I'd have to look to be sure. What was done on the secondary deal was to take some material off the back side of the helix where the snap ring is. This allows it to open fart...

I have one here that has an oil pump delete cover that replaces the pump. Bolts right on in place of the pump and seals up the tach drive. I'd have to go look again but it might have a grease fitting on it so the tach worm gear can be lubed on occasion. The old SRX's (79 and down) didn't have any ab...

Got the knocking gone it was a flat spot in the belt got a new belt and woke it right up next purchase is flat slide carburetor Don't waste your $ for a flat slide on a stocker. Youw will be inviting problems much harder to solve than a flat spot on a belt. In well tuned stock form these sleds are ...

i noticed today it gets louder as i turn. could it be loose cog wheels. and i know the belt is bad but what could make it knock. You keep driving it and eventually the noise will cease. Then you can drag it back home and it's location will be evident. The cost/time to repair will be much higher too...

THIS IS WHEN YAMAHA DRIVES YA TO DRINK. MY 83 AS STOCK 8U9 CARBS. NO NEEDLES ON CHOKES. 3:16 (yammie tony) Ya, and the parts book shows an 8U9 part # for all the plungers on all the years and even on all the EX570's with 38 Mics. I didn't look at the end of the part # though. It could have had a -0...

After Vmax-540's post I checked three sets of 540 carbs I have on the shelf today and all three have the needles on the plungers so I was wrong (thanks for the correction). They do have them so you should be good there. It still sounded real fat down low and as Tony said never seemed to clean up. Un...

Those plungers could be your problem. The original didn't have the pin like the ones you are using. I listened to the vid and it sounds fat and blubbery down low just like a choke not sealing right. All the round slide 38 Mics Yamaha used on the 540 and even the Exciter 570 used an 8U9 choke plunger...

The bridge has been knifed but that looks to be about it.

opsled

Near new condition.

http://www.ebay.com/itm/190755441619?ss ... 1586.l2649

Probably won't find one nicer.

Yes it is mine.

opsled

That one in the pics was an 85 (80N). It was also a low miles engine that I ran before teardown. I went through it with new rings, gaskets and seals. Went through the carbs and timed it. Sold as pictured with carbs, cables, CDI and coil, mounts ect. Might have sent him the fuel pumps and wiring harn...

They used the stock Yamaha flanges with Aaens. opsled PS, Killer, I have all the parts to work you up an 87 engine if you want. Wouldn't be cheap but would be nice. Good low miles bottom with new seals, nice stock chrome cylinders, new oem pistons/rings/gaskets, perfect head, 87 ignition. Nice set o...

What sled? May not have enough output on the lighting coil to run both at low rpm. Added handle bar warmers to early 540's caused some issues like that. Your Digitron may require more juice than what's available. Later 540's (85? and up) had an extra coil just for warmers (yellow/black). Yellow and ...

All are gone.

opsled

If needed I have a nice set of stock 8M6 pipes and can.

opsled