Complete loss of power... :(

[Cog Head]

riding around tonight with a m8, going about 60 or so, felt the bike randomly start to slow (down a gear) keeps bogging down (i put £5 in my tank about 10 mins erlier) keep going down gears until i am in 1st going about 5Mph.
it sounded like i had ranout fo petrol but i diddnt, radiator has some mud on it, nothing major, just a small strip from the road crap flinging of my tyre.
i stopped, then tyred to pull away, nothing...so i got the bike on the pavementand it was ticking over fine, normal speed of tickover...i waited for about 30 seconds for my m8 stu who screamed off ahead to come back...but diddnt, so i attempted to pul away and the bike was behaving completly normal again...later on about a mile down the road it did it again, pulled over waited and then continued, this happened about 4 times on the way home from where ever we where...

Any ideas ?
i think too much oil and not enough pertol
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Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[steveh]

im guessing its a Rieju RS2 50cc, could of said, i had this with mine, oil was getting into the air filter box and doing the above, clean the air filter, or change it, set the mixture, if all else fails, check your piston and barrel.



Steve.
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Current : 06 Zx10r, 07 Wr450f SM, 74 850 norton commando, 63 bsa b40, 1962 Triton 650, 67 Triumph Tr6r, 1955 Triton 750, 1978 TY250E.

[Cog Head]

[Superlight]

Sounds like it could be carburettor icing. (Put simply - moisture in atmosphere freezes in carb, then defrosts when you're stationary with the engine running, freezes up again when you get going.)

Assuming that there's nothing wrong with the carb, and you're using decent oil, there may not be much you can do about it.

The best solution - don't ride when it's cold.
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You only need two tools: WD-40 and Duct Tape.
If it doesn't move but should, use the WD-40.
If it shouldn't move but does, use the Duct Tape.

[Superlight]

Then again, it could be what he said!
____________________
You only need two tools: WD-40 and Duct Tape.
If it doesn't move but should, use the WD-40.
If it shouldn't move but does, use the Duct Tape.

[Cog Head]

[Kickstart]

Hi

Carb icing would be possible, but not that likely. Not damp today and carb icing shouldn't be as common as people think.

My guess would be that the fuel tank breather is blocked. Fuel leaves the tank and air needs to get in to replace it. If the breather is blocked then the air cannot get in which slows down and eventually stops the fuel getting out.

Next time it does it open the petrol cap (as quickly as you can) and listen to see if you can hear a sudden rush of air going in. Also see if the bike then runs fine for a short while.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Cog Head]

[Kickstart]

[the grim reaper]

If it was the fuel breather, it would probably stall as the carb bowls would be empty and would need the blockage to be cleared to fill up again. It could be that the rate of fuel being used slows to less than is allowed to flow by the vacuum, whilst idling, but it's unlikely.

Carb icing would be my guess, Pro FST is your friend.

Cheers

Grim
____________________
Adverts don't always work: Remember that advert, where the army are running across the desert and they have a wounded man on a stretcher. They get to a ravine, the bridge is down and a caption pops up that says, 'What are you thinking?'. I don't know about you but I was thinking, 'Christ, I'm glad I'm not in the f***ing army'.

[Kickstart]

[ancientd]

Icing on carburated bikes is common in the UK at any temperature below 5 degrees C. Some bikes suffer others are OK, my Thundercat suffers every year between November and April. The simple solution is a 2% mixture of Silcolene Pro FST added to the fuel. Icing is getting rarer these days as most bikes are being produced with fuel injection instead of carburettors.
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I ride 3 bikes, a Thundercat, an FZRexup 1000 Streetfighter and a Jawa 350 Combo, something for all seasons.

[Bezzer]

It won't be carb icing, if the symptoms are as bad as said it would cut out when he slowed right down as the idle circuit is most affected by the ice.
Has it got a tank overflow vent as well as a tank breather?? Seen it before where the tank breather was clogged so it breathed through the overflow vent, fill up with petrol and you block that air route causing the vacuum and loss of fuel to the carbs.
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I used to be indecisive but now I'm not quite so sure.

[ancientd]

[Kickstart]

[ancientd]

With humidity above 80% and temperatures below 3 degrees I would have thought any bike that was liable to ice up will, particularly on a sustained highish speed run. I permanently run the Cat on a 2% PRO FST mix from November to April and don't have any problems, had a reminder back in November, I hadn't put any in as it seemed warm, went out early one morning and stopped after 12 miles. Crept home to get the FST in the tank.
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I ride 3 bikes, a Thundercat, an FZRexup 1000 Streetfighter and a Jawa 350 Combo, something for all seasons.

[Chiz]

I'd go with carb icing. My mates RX50 always iced up when it was cold, i think most of the 50cc geared engines are the same (minarelli AM6), try some silkolene stuff, always did the trick for him.

[Cog Head]

i went for a little ride about erlyer, to book my bike into Bike tec neer me, to get my carb jetted for my race exhaust, and then went to a few shops to try to find some not stupidly priced mesh for the vents in my fairings and the LH side had died for some reason , but seemed ok, i was purposely giving it some every where to try to get it to do it again, but nothing, so may be carb icing...

Ow yeah i got back in and cleaned my bike, i finished it and went around the block just for the sake of it. got back and rolled my bike backwords into my garage and pulled the front break and, clunk , one of the bolts has grown legs and flew away
looked every where for it...i think its a 9-10 mil bolt as i put a 8.8 in and it wobbled a little when i screwed it in...
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[Bezzer]

[Cog Head]

i see... then those bolts i rtyed where 8 mil and iv just tryed a 10 mil and its just too big, so it looks like its a 9 mil bolt that im missing
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[Bezzer]

Doubt it's a 9mm thread probably won't ever find one on a bike, it might be the thread is slightly knackered in the hole it dropped out of so the 8mm bolt is a sloppy fit.
If it's holding something important then you'll have to sort it properly - helicoil etc, if its just cosmetic then use some thread lock.
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I used to be indecisive but now I'm not quite so sure.

[Kickstart]

Hi

Not ever seen an M9 bolt for sale (probably available, but not generally used). For a brake caliper I would buy an original bolt from the dealer. Having the mounting bolts shear off when braking hard as they are the wrong grade would not be fun.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Cog Head]

Good point...im going to remove the bottom fixing bolt and take it to sutton motorcycles and bike tec to see if they have one. if not ill just wait for me dad to come home tonight to have a look see if we have any bolts to fit...
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp