Morcs
Junior Member
Please read whole post:
My 04 FZ starts backfiring, not big bang bangs, but a constant burble crackle even on a constant throttle below 50mph now. I cant test it on the open road as my license is restricted for work use at current - My commute is about 30 minutes, and 20 miles. Mixed between 60mph motorways and 30mph areas. This has been going on for a few months.
The problem seems to occur once the bike has warmed up, and then been opened up a wee bit (not even red line or high speed though) on the second stretch of motorway just before work, after the little squirt and back into traffic its almost unridable - and having to hold it at 3k+ rpm when sat at the lights to stop it dying - so about 20mins into my ride.
I had this problem a little bit when the bike was stock - just with drilled pipes and the airbox mod - but it wasnt much of a problem, just a nuisance. Now its horrible since I put the leo vinces on
Yesterday I decided to patch up my air intake, and then raised the tank a few mm at the front (in front of the battery is full of my radar's wiring, so thought was restricting air supply a wee bit.
I also did +24 on C1 and C2 like someone here had the best dyno results from.
My bike was put on the dyno a few weeks back and the dealer said the power delivery is fine - though id doubt with the nature of how the problem appears, that theyd be able to replicate it.
I put new iridium plugs in too, and the TPS has been replaced twice in the bikes life and is OK now.
The only left wing thing i can think of here is a clogged oil filter? I was too lazy and didnt have the means of removing when I last did a change - but is this a potential cause?
EDIT: just spoke to the shop, they suggested my fuel could be off - surely not though, I used to use the bike twice a week before (though fanging in the countryside), but ive dumped some fuel injector cleaner into the tank - this still doesnt explain why it runs fine for a while.
Another option is to give it to a mate to take it for a good thrash to see if it improves as it hasnt been ridden ridden in 3 months now.
So this is the summary of what Ive done:
-----------------------------------------
Airbox mod - reverted to stock and back again to modded - no change
Raised the tank a few mm for better airflow and back to stock - No change
Changed old plugs for new iridiums - No change (though old plugs were wet and oily)
Stock pipes to Leovince with cat elim and baffles out - no change, a bit worse if anything
C1 and C2 +24 then back to stock - No change
Just put a load of injector cleaner into the tank to run through.
Bike is booked into a shop with a dyno on wednesday, id rather give it to them with a rough idea of where to look rather than paying them to go through all the things Ive already done, and some.
Please please give me some ideas guys, I dont want to pay my dealer for 3 hours labour just for looking at it...
My 04 FZ starts backfiring, not big bang bangs, but a constant burble crackle even on a constant throttle below 50mph now. I cant test it on the open road as my license is restricted for work use at current - My commute is about 30 minutes, and 20 miles. Mixed between 60mph motorways and 30mph areas. This has been going on for a few months.
The problem seems to occur once the bike has warmed up, and then been opened up a wee bit (not even red line or high speed though) on the second stretch of motorway just before work, after the little squirt and back into traffic its almost unridable - and having to hold it at 3k+ rpm when sat at the lights to stop it dying - so about 20mins into my ride.
I had this problem a little bit when the bike was stock - just with drilled pipes and the airbox mod - but it wasnt much of a problem, just a nuisance. Now its horrible since I put the leo vinces on
Yesterday I decided to patch up my air intake, and then raised the tank a few mm at the front (in front of the battery is full of my radar's wiring, so thought was restricting air supply a wee bit.
I also did +24 on C1 and C2 like someone here had the best dyno results from.
My bike was put on the dyno a few weeks back and the dealer said the power delivery is fine - though id doubt with the nature of how the problem appears, that theyd be able to replicate it.
I put new iridium plugs in too, and the TPS has been replaced twice in the bikes life and is OK now.
The only left wing thing i can think of here is a clogged oil filter? I was too lazy and didnt have the means of removing when I last did a change - but is this a potential cause?
EDIT: just spoke to the shop, they suggested my fuel could be off - surely not though, I used to use the bike twice a week before (though fanging in the countryside), but ive dumped some fuel injector cleaner into the tank - this still doesnt explain why it runs fine for a while.
Another option is to give it to a mate to take it for a good thrash to see if it improves as it hasnt been ridden ridden in 3 months now.
So this is the summary of what Ive done:
-----------------------------------------
Airbox mod - reverted to stock and back again to modded - no change
Raised the tank a few mm for better airflow and back to stock - No change
Changed old plugs for new iridiums - No change (though old plugs were wet and oily)
Stock pipes to Leovince with cat elim and baffles out - no change, a bit worse if anything
C1 and C2 +24 then back to stock - No change
Just put a load of injector cleaner into the tank to run through.
Bike is booked into a shop with a dyno on wednesday, id rather give it to them with a rough idea of where to look rather than paying them to go through all the things Ive already done, and some.
Please please give me some ideas guys, I dont want to pay my dealer for 3 hours labour just for looking at it...
