Yamaha TRX850 Enthusiasts Forum

hi,could anyone advise,can CDI unit be faulty (ie) cause misfiring,or do they just dont spark at all.i have checked pick up coil resistance and that is ok, but have still got a problem.

It could be but what else have you checked so far?

hi, i had the same problem.................ended up being the the fule pump.

so what happens if you just run the bike on prime on the fuel tap???

Does it affect the bike if there is air in the line between the 1st and 2nd pumps? I've got a inline filter between the two and cant get the air in the filter out. While writing this i just thought i could but the filter in the line from the last pump to the carb but the question still stands.
Jay.

2nd pump? there`s only the one!

Oh yeah, my mistake. i was thinking that as it has a vacuum hose that its a pump, obviously thats not the case, the vacuum opens the diaphragm to let the fuel through.
Still, do i need to get rid of the air in the line before 'the' pump? Would the air in the line cause the pump to work inefficiently?
I will be moving the fuel filter later so may answer my own question.
Jay

The first step is always to make sure the problem is either fuel or spark and then evolve from then on.

The easiest/cheapest way to solve this would be for you to get in touch with a kind soul who's got a TRX near you and spend a day changing bits from one bike to the other untill the problem is solved.


Where abouts are you?

scarfacehugo wrote:The first step is always to make sure the problem is either fuel or spark and then evolve from then on.

The easiest/cheapest way to solve this would be for you to get in touch with a kind soul who's got a TRX near you and spend a day changing bits from one bike to the other untill the problem is solved.


Where abouts are you?

hi mate,did all checks (ie)fuel and sparks,have now found cause,burnt exhaust valve,had to buy a compression tester thanks for reply.does anybody know best place to buy a valve and valve stem seals top end gasket set.by the way i am in derbyshire.also too all thats had dealings with biker nut 1986 or fruit and nut 1986 i have been messed around as well sent him money for fuel tank and got all the excuses went on for six weeks,in the end had to get paypal too resolve it. what a tosser he was.

ferretkeeper wrote: hi mate,did all checks (ie)fuel and sparks,have now found cause,burnt exhaust valve,had to buy a compression tester thanks for reply.does anybody know best place to buy a valve and valve stem seals top end gasket set.by the way i am in derbyshire.also too all thats had dealings with biker nut 1986 or fruit and nut 1986 i have been messed around as well sent him money for fuel tank and got all the excuses went on for six weeks,in the end had to get paypal too resolve it. what a tosser he was.

Yamaha dealer?

ferretkeeper wrote:

scarfacehugo wrote:The first step is always to make sure the problem is either fuel or spark and then evolve from then on.

The easiest/cheapest way to solve this would be for you to get in touch with a kind soul who's got a TRX near you and spend a day changing bits from one bike to the other untill the problem is solved.


Where abouts are you?

hi mate,did all checks (ie)fuel and sparks,have now found cause,burnt exhaust valve,had to buy a compression tester thanks for reply.does anybody know best place to buy a valve and valve stem seals top end gasket set.by the way i am in derbyshire.also too all thats had dealings with biker nut 1986 or fruit and nut 1986 i have been messed around as well sent him money for fuel tank and got all the excuses went on for six weeks,in the end had to get paypal too resolve it. what a tosser he was.

For what you want either through a Yamaha dealer or Kedo:

http://www.kedo.de/

Kedo are great to deal with, a little barrier with their English site translations but if you speak to them direct it`s no problem.