Need Help Yami old triple

M

mjkaliszak

New member
I have a 98 Yamaha V-max 600 triiple sitting here in the cave, we have spark, gas, compression in all 3 but it is not firing on " 3 " PTO cylinder. We jumped the TPS back to itself trying to check switch but to no avail. The racing idle did correct itself when we jumped the TPS switch. NEED INPUT. We also swapped coils 2 to 3 just for the heck of it still not firing. Any input ? We still can't get the #3 to fire.
 
indy_500

indy_500

Well-known member
take off the y (sorry, what would you call this? the E pipe? or is it triple piped?) pipe and take a peak at what she looks like. Maybe a clogged jet? fouled plug? try simple things, sometimes, something that seems so extreme just takes a simple fix.
 
Last edited:
D

dab102999

New member
old yammy tripples either ran like a raped ape or dead in the water...great motor expessially the 700 but when those trip's gave you trouble it seemed like it would never end. first thing I would do is clean the crap out of the carbs....switch your coils again....and swap the fuel lines once other two options don't work...those fuel pumps were known to go bad and not deliver to one cylinder...I got a buddy with a 98 700 that he had in 5 or 6 different times and finally got tired of paying to have the machine run for 5 miles and then start fouling plugs...I finally told him to let me have it for a while and see what I could find out...I was determined that it was all carb and after cleaning them like 4 times over 3 days solved his problem and machine has been a great back up machine for him for years now....also you didn't say but did you check your compression???
 
T

trailshredder

Member
First of all he says he has "spark, gas and compression in ALL 3 cylinders"????? But no "fire" on the PTO cylinder. Well my guess would be to check the compression on the PTO. See what it reads....cause gas + spark = fire.
 
V

vx700xtc

Member
have you tried moving the spark plugs around?, Also switch the coil wires(not the coils). I one time had a brand new plug that would not fire.
 
S

snoduke

New member
I have had resiter spark plug cap go bad. I always carry a spare. Have broke them bfore too.

Snoduke
 
M

mjkaliszak

New member
Thanks for the reply's. We found a sticky TPS and a junk flowing carb. TPS was bad at the t-lever, sprayed it with di-electric grease lube. Then we dumped fuel right in the plug hole and it screamed until we ran out of fuel. We all 3 of us knuckleheads got the carb rack out and 1 tore down, we are going to go thru all. It was really ghosting me with multiple problems which at the start from my friends description sounded like bad crank seals or cracked boot, it would rev up and not back off when the throttle released. We had 115-115-110 on the PTO side , supposed to be common for these ???? Still not a bad spread.
If we get the carbs all good i think it is solved. POS TPS's can really throw you when there are other problems. I kind of like the 1 problem .... problems.
Thanks
 
You must log in or register to reply here.
Top