so im a bit stumped as to what happened there. On 6 or 7 occasions the bike completely lost all power and died. mostly when it fell to low revs while at traffic lights and roundabouts, but on two occasions it happened at full throttle at about 7-8k revs. after a minute or so turned off it would fire right back up and be fine for 5-10 mins till the next roundabout. i have little tinkering knowlage but ive checked little bits already to try and narrow it down. fuel pump is a sealed unit so I can't really check that.the fact it was the same problem at full throttle and closed makes me doubt that it would have been that. checked the air filter which was clean and dry.checked for any oil leaks. oil colour taken off the dipstick is a light Brown with no milky stuff and a change due in another 500 miles. oil level was fine. valve clearances were checked by dealer and spark plug replaced at last service 1600 miles ago. just took off the crankcase breather tube thingy and it was full to the brim with water. washed the bike yesterday (not pressure washer) and the rain today is my only explaination for that? ive no idea if that being full could cause the problem, if its a symptom of something else and also if simply emptying it will fix the issue? im gonna get the bike warm and pop around the block a few times to see if it happens again. is there any simple checks im missing or anything else you think may be causing it besides water? Cheers peeps
After riding behind you I'd say possible spray/ rain getting into the cylinder I know it's only a 125 but common fault on a lot of twins Is your plug in view on the front? If so what ht lead does it have on it?
seems like the nut part of the spark plug is slightly corroded. trying to find the right socket for my torque wrench so I can get it off and have a look at the plug. heading out after my dinner so will update if it occurs again and check the plug when im back
Corrosion around the plugs is normal,you will need a plug spanner to get them out,be real careful you get a good fit on the plug otherwise you could strip the thread in the head
yeah the plug was fine. I used a socket specially for plugs and checked manual for tightening settings. (expected a torque setting but manual just said 1/8 of a turn so did as I was told lol) im out of ideas so I can only put it down to water as dayo and wardy have suggested. is there anything I can do to prevent it happening again in the future? as It left me in a couple of pretty dangerous situations. It was literally bathed in acf50 last night. engine heat must have burned it off. cheers
cheers. will give that a go. just got back from from giving it a test for 40 mins and seems fine now. no hiccups at all at high revs, low revs and about 5 mins of idle while I had a smoke. ill make sure I mention it when it goes in for its next service so it can be checked over by someone more savvy than myself. fingers crossed thats the last time it happens.
nope that was Nathan94 if I remember correctly? im on a 4 stroke cbf125. bike died a few times while on todays ride-out.
I used to have plenty issues riding an old scooter (and a mini) in the rain. First thing I'd investigate is the feed to the spark plug and ensure its water proof.
Tbh my 125 never really coped well in the wet either had the same problem Sent from my SM-T310 using Tapatalk
yeah that's a Common fualt on the cbf but the water issue makes the most sense. especially with the crankcase breather tube being completely full of water. i will get it looked at when it's next serviced but it didn't seem to match all of the symptoms people have put online. It didn't only cut out at low revs which is what most others experienced. It happened at full throttle at almost redline too. my thoughts behind ruling it out is that at full throttle the speed of the flow would be sufficient to force petrol through any partial blockages and keep the engine going. it would be less responsive of course but id still be able to sluggishly continue until id slowed down and reduced revs. I'll admit I may be completely out with my assumption though... I've never had an opportunity to learn about engines other then basic maintenence
Fuel pump guaranteed, we have one with exactly the same symptoms, will run fine for ages then play up. I have had it off and cleaned/emptied it out, there was plenty of shite in it, but it hasn't done many miles to see if this has worked. As you say it seems to be a common fault for which Honda don't seem to want to admit.
It's an injected engine, the injector needs pressure for the fuel to be atomised from the injector. Gravity is not enough.
I would start cheap and simple. Get some tubular insulation. Remove the HT cap and sheath the HT lead with the insulation. This will eliminate the HT lead shorting across to the engine block when it is wet. Next would be the coil. Put some form of secondary insulation or water deflection on it.
makes sense that actually. cheers. will only really be doing my 4 mile commute between now and my next service so ill make sure they look at the fuel pump then in case that had something to do with it.
