Justinmckenzie
New member
I have a 1998 Yamaha venture 700 triple deluxe. It ran perfectly fine, always serviced at the dealer every fall. It was parked for a year then then all hell broke loose. It would idle, but as soon as I would give it throttle it would bog down. I couldn't figure it out. So I brought it to the dealer, they checked and cleaned the carbs, apperently there was a stick needle. They checked phasing, changed the plugs, adjusted the clutch, still a bogg and missfire. They said it might be a CDI box ... So I changed the cdu box. Exact same. I changed the stator and cleaned the fly wheel, same thing.
So we know the carbs are good, clutching is good, plugs are good, 125 psi in all 3 cylinders good resistance in the coils, stator and flywheel are good... I've spent $1000 on this old sled trying to figure out the issue and still can't find it! Ive checked all visible wiring and bypassed the throttle switch. Any ideas where I should start looking next?
So we know the carbs are good, clutching is good, plugs are good, 125 psi in all 3 cylinders good resistance in the coils, stator and flywheel are good... I've spent $1000 on this old sled trying to figure out the issue and still can't find it! Ive checked all visible wiring and bypassed the throttle switch. Any ideas where I should start looking next?
One of those things can’t be right.
I was chasing a similar issue on a Polaris last season. After changing most parts you mentioned I checked the fuel pump that had some bad membranes. Also try bypassing any fuel filter from tank to fuel pump and also check in-tank fuel hose. Could check crankcase vacuum pulse line also.
A couple of bucks
VIP Member
1. Take some used plugs and clean them up w/ a bench wire wheel.
2. Install.
3. After sled is good and warm, remove them.
4. The plug that is the cleanest needs to have its pilots scrutinized. Or just changed for piece of mind.
2. Install.
3. After sled is good and warm, remove them.
4. The plug that is the cleanest needs to have its pilots scrutinized. Or just changed for piece of mind.
A couple of bucks
VIP Member
See if it revs w/ the addition of fuel and throttle.
A couple of bucks
VIP Member
It bet a dime to a dollar that while you have the throttle cracked and it's bogging, if you give it a shot of fuel it'll pick right up.
odds are fuel filter in the tank is bad.
A couple of bucks
VIP Member
Ahhhh ... good call. Ethanol snot.
Justinmckenzie
New member
Will go after the fuel system this week!
snowhite
Member
Nobody mentioned the throttle gap! If the cable is not adjusted properly the throttle cut out switch is activated.