misfiring no power could have blown engine

[vic freak]

hi guys need some advice just comming back home from a friends house on my storm about half an hour ago , when she started to misfire as if running on 1 cylinder, but still running on 2 but no power backfiring lots & burbling more than usual when shutting off the throttle , to me this has all the hallmarks of a blown piston, i was only 1 mile from home so nursed it back , got it in the garage and thought sod it ill give it some revs & see if it blows smoke but it didnt, ccts where changed 1000 miles ago , and the clutch had been quite noisey but they are all like that, revs up rough as hell lots of spluttering & vibration,like i said no power any advice would be welcome, i use this bike daily for work & my mrs aint that happy about taking me to work , signed one gutted firestorm owner,

[slipper 1]

Did you replace the CCT's with standard ones or manual ones?

[vic freak]

hi, standard ones from dave silver

[tinysmall]

Have you checked that that the link pipes are still linking? I had the same symptoms on my bandit when a poorly fitted gasket resulted in me firing my end can out the back of the bike and down the road.

[vic freak]

i havent looked to be honest , i hope your right, i will have to have do some investigating tommorrow night , i will also check the plugs & electrics, not long fitted cbr 125 rectifier, could be cdi had one go on vfr , i have a gut feeling its more serious though,

[benny hedges]

if its the cdi or ignition box let me know as i have spares.
check each cylinder is sparking and no arcing... easiest way is fire it up in a dark garage and have a look under around the ht leads.
also could be just a bit of crap in one of the main jets
look for the simple things first

[vtryorks]

This sounds incredibly like what I've had on mine...except it does have power. The symptoms are similar. Its going into a dealers next week. I'll post an update on the forum with details.

[tony.mon]

My bet is CCT failure, even though you replaced them recently.

To check, take off seat, tank, airbox, then you can see the front cct.
Undo and remove the 8mm cap bolt on the end of the cct and put a tiny flat blade screwdriver down the cct, locate it in the end of the cct and try to turn it clockwise and anticlockwise.
in one direction you will feel it tighten as it pushes onto the tensioner, but in the other it should become looser, and then spring back into tension once you release the screwdriver.
If it just stays where it is then the spring has failed.

You can check the rear one first, but it's usually the front one that goes.
When you undo the cap bolt on the rear one a small amount of oil dribbles out, have a rag under it.

You need to check both, only one will have failed so you can tell quite easily which one is working ok and which one isn't.


The burbling, backfiring, misfiring are all classic symptoms of cct failure, as it will have bent two exhaust valves and when the ignition spark happens it fires some of the charge as it leaks past the valves, as they aren't sealing properly.

BTW, this is URGENT, and the bike shouldn't be started or ridden until you've checked it. Check and report back, and we'll take it further if it isn't cct's, but this MUST be checked before you do anything else.
Good luck...

It's very unlikely to have burnt a hole in the piston, or broken rings, it almost never happens on these engines, even when tuned.

[vic freak]

HI all thanks for all your help, could not sleep so got up at 5am and got busy , checked ccts they are ok,(gonna order some manual ones me thinks) stripped carbs & it was a blocked jet (thank god) cleaned out float bowls, & ordered a new fuel filter, rode her to work and took her up to a ton twenty no problem. next project to rebuild that noisey clutch, if your storm feels as if its run out of petrol(which mast of us have probably experienced)but with a full tank, 1 you could have overfilled the tank as firestorms use a vacum as a fuel tap ,2 a lump of crap in the in the jets, so all ends up well , again thanks for your help and suggesgions , my mrs was happy she could lay in bed a bit longer listening to her new cd of hitlers speeches,

[AMCQ46]

good work getting it found and fixed.

your wife sounds like she might be related to mine

[tony.mon]

Result, well done for finding the fault.

manuals= peace of mind