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Just a comment based on what I've been doing to mine. You mentioned you sync'd the carbs via a caliper. I did something similar on mine & thought that OK but last wk I sync'd with vacuum gauges & they were way off. I was having to reset the idle half a dozen times while doing it as it going to...

Yeah, my autistic brain taking 'vent' literally. These are breather tubes (I know - see 1st sentence). There should be long tubes (7mm bore) that run up the side of the airbox (2 each side) & fit on a small bracket near the air intake opening on the air box. They make refitting the airbox a tiny...

No 'vents' on mine. Not even the one overflow shown in the Haynes manual. Are you talking about the drain tubes?

Tip for setting the float height. I cut a length of plastic rod (Q-tip / cotton-bud stem) to 28mm then taped on a tap of card to hold it with. Used that as gauge. Carbs need to resting at an angle & upside down (as seen in the pic) so that the float tab is lightly resting on the float needle...

Thanks guys. Does anyone know what size OEM actually are then (if they aren't 27mm id 2.5mm c/s)? Where I got to today. I stopped the leak. Having thought about the oval shape of the old o-ring I (correctly) remembered that the flange of the pipe wasn't sitting square against the socket rim...

Mine are not Yamaha ones (the only place I could find them would have cost £15 ea! & been imported). I don't know what the OEM ones are made from. The ones I removed feel like nitrile. I bought Viton ones which are def harder rubber. They are meant to be the same size, 27mm id & 2.5mm c/s & are...

@Jack Hammer Thanks. I've ordered some 3mm c/s nitriles as nitrile seems more squishy than viton & I have info from elsewhere that 3mm viton will not fit. I'll look at AC o-rings if 3mm nitrile also don't fit.

There are people in the world, such as myself, for whom the bleedin' obvious is anything but (& it's a royal pain in the bum). So believe me, it's much appreciated when someone does just that. Thanks.

I have a '98 Canadian import - also does not have the 'L' tab but they do have a short metal tube spacer that prevents over tightening in the same way. I think I can see these in your 2nd picture. Have a look with an inspection mirror if you have one.

Having changed the coolant, doing an engine flush, replacing the radiator drain valve assembly & a hose (& fixing leaky crabs) I ran the engine for a while to get everything upto temp to check for leaks etc. I noticed that occasionally the temp gauge would flutter or just drop straight to...

The rigid plastic eblow pipe connecting the thermostat housing to the water pump. I had a very small leak at the water-pump end joint. Took it off gave it a damn good clean, repainted it & fitted new O-rings. (Spigots were masked off for painting.) Has made it so much worse. New are O-rings...

OEM fuel pump is 3-4 psi. I recently fitted a cheap ebay OEM type pump which looks to be working fine. Have a look at this thread. https://www.vmaxforum.net/threads/replacement-fuel-pump-bracket-swap-pt1.51865/

All I can say is that charging the battery made clattering stop on 2 different occasions. I made no other changes. I did it the 2nd time as this had worked the 1st time.

Seems to be a theme on this bike. So many times I've asked why the hell have they done that?

recently fitted one of the cheap fleabay ones. not had any trouble so far. https://www.vmaxforum.net/threads/replacement-fuel-pump-bracket-swap-pt1.51865/#post-527130

If recall correctly (which is always open to question) the 'spit' / 'sneeze' is weak mixture/too much air. See if a little bit of choke makes it disappear. If so check your carb joint rubbers (to engine & air box) are in good condition & fully seated clamped tight. If there is no vacuum leak I...

Sorry to but in - I'd be interested in that if I may.

1st point of call for me would be - check your battery. Is it in good condition & charging properly. Fully charged battery should be around 13V though anything app. 12.5 should be OK. It should hold that near that level for at least a week. App.11v or less is 'flat'. You should be getting app...

Here's the link to part 2. Better late than never. https://www.vmaxforum.net/threads/replacement-fuel-pump-bracket-swap-pt2.51866/

I'd be checking 2 other things. Vacuum leaks on the carb to intake rubbers AND airbox to carb rubbers as a possible. Otherwise that sounds awfully like back pressure from an incompatible aftermarket exhaust or a compatible exhaust that has not had the other required modifications done (gen to...