Dual carriageway tips?

[fizzwheel]

I really doubt its carb icing, you'll only get it when its cold and damp. So I reckon you can safely rule that out, if the weather where you are is like the weather where I am i.e sunny and about 10 degree's...

You've probably got a fueling issue, I think you're right, if you dont have a clue get somebody to check it over for you... CG's are very simple though so its a good a place as any to start with home spannering....

[ogden]

Originally Posted by fizzwheel

I really doubt its carb icing, you'll only get it when its cold and damp. So I reckon you can safely rule that out, if the weather where you are is like the weather where I am i.e sunny and about 10 degree's...

There can be plenty of moisture in the air at any time and, while the ambient temperature may be 10 degrees, the temperature in the carb will be significantly lower due to the venturi effect, so carb icing can manifest at higher temperatures than you might expect. My 7R was a sod for it.

[ogden]

Originally Posted by Magnum

Is carb icing what is says on the tin? (affected by very cold weather?) because it hasn't been all that cold, and i always let the bike warm up for about 10 mins.

AIUI, carb icing is caused by the temperature in the carb being low enough for moisture in the air to condense and freeze on the jet, affecting the flow of fuel. The low temperature is caused by the venturi effect in the carb - as the pressure drops, so does the temperature.

It doesn't have to be a cold day and it doesn't have to be raining, just have sufficiently high relative humidity. It affects warm engines as much as cold ones - I once had it for 300 miles from Bracknell to Bodmin and had the choice of doing 30mph or 130mph but pretty much nothing inbetween. Rubbish.

Originally Posted by Ed

You're too harsh. Remember that Magnum is 17 and that it will be his first time on a DC on a bike.

Doesnt mean anything. Although being pillion since i could fit probably helped with the whole idea.
But even at 16 i went on small sections of DC (50mph top speed was enough ) now 17...sv650.... im flying past things rather than the other way round.

Just remember, stay in the middle of your lane and drive defensively/safely speed isnt everything.

Originally Posted by BBadger

Doesnt mean anything. Although being pillion since i could fit probably helped with the whole idea.
But even at 16 i went on small sections of DC (50mph top speed was enough ) now 17...sv650.... im flying past things rather than the other way round.

Just remember, stay in the middle of your lane and drive defensively/safely speed isnt everything.

Maybe not everyone has your level of confidence.

Originally Posted by ogden

AIUI, carb icing is caused by the temperature in the carb being low enough for moisture in the air to condense and freeze on the jet, affecting the flow of fuel. The low temperature is caused by the venturi effect in the carb - as the pressure drops, so does the temperature.

It doesn't have to be a cold day and it doesn't have to be raining, just have sufficiently high relative humidity. It affects warm engines as much as cold ones - I once had it for 300 miles from Bracknell to Bodmin and had the choice of doing 30mph or 130mph but pretty much nothing inbetween. Rubbish.

This could have been the problem then.
One of the main 'symptoms' i had was the bike jerking and also top gear was very dead. For some reason i was able to go faster in fourth! Is this an affect of carb icing?

[ogden]

Originally Posted by Magnum

This could have been the problem then.
One of the main 'symptoms' i had was the bike jerking and also top gear was very dead. For some reason i was able to go faster in fourth! Is this an affect of carb icing?

My experience has been that it causes severe stuttering - to the point of misfire - and I've generally been able to trickle along on the idle jet or nail it hard, but can't run on part throttle. Depends which jets are iced up really. I only really had it on a ZX7R so I had four carbs to play with, you've only got one so you could suffer more.

One thing to remember is you're riding a CG125, not an RS125. 55mph is about as fast as it's going to go on the flat. Top gear's always going to be pretty dead. That's what two-strokes are for

Originally Posted by ogden

My experience has been that it causes severe stuttering - to the point of misfire - and I've generally been able to trickle along on the idle jet or nail it hard, but can't run on part throttle. Depends which jets are iced up really. I only really had it on a ZX7R so I had four carbs to play with, you've only got one so you could suffer more.

One thing to remember is you're riding a CG125, not an RS125. 55mph is about as fast as it's going to go on the flat. Top gear's always going to be pretty dead. That's what two-strokes are for

Thanks. How can i stop t from icing? I don't fancy this problem every time i want to have a bit of speed.

I cant wait to have the SV now, just to have the extra power. I didnt like the fact i had nothing in reserve.

[fizzwheel]

Originally Posted by Magnum

Thanks. How can i stop t from icing? I don't fancy this problem every time i want to have a bit of speed.

Use a premium fuel such as Shell Optimax or use a fuel additive such as Silkolene Pro FST.

Originally Posted by Magnum

I cant wait to have the SV now, just to have the extra power. I didnt like the fact i had nothing in reserve.

Thats 125's for you, its one of the reasons I didnt take my 125 on fast main roads or dual carrigeways, I never felt safe as I couldnt keep up with the traffic flow.

I used to find the wind really effected my 125 as well. It used to not like a strong headwind it was really noticeable in terms of reduced top end speed.

[ogden]

Originally Posted by Magnum

I cant wait to have the SV now, just to have the extra power. I didnt like the fact i had nothing in reserve.

That's restricted 125s for you. First thing I did to my TZR125 back in the day was turn the valve, which took it from 12bhp to 23bhp and boosted the top speed from around 70 to roughly a ton.

You should see a similar improvement from the CG (11bhp/96kg = 114bhp/tonne) to the SV (33bhp/165kg = 200bhp/tonne, the same as my old TZR!)

How long are you stuck on a 125?