Valve Float

[K-Saletta]

I have a yerf dog with a heavily modified predator 212 (I have 18lb springs). I was riding it with throttle fully opened and the chain fell off and the engine revved high and stopped like it was hitting the rev limiter on a car. Is that valve float? I couldn't look at the rpm because my tach is very hard to look at but it sounded pretty high.

 

[rmm727]

More than likely valve float.

 

[Camjamsdad]

Sounds like valve float. Depending on your cam it could be coil bind as well

 

[K-Saletta]

Thanks guys! And what is coil bind?

 

[rmm727]

where the coils of the valve spring have no space in between them and touch.

 

[K-Saletta]

Oh I see thanks I just looked at some pictures of that - so I would probably need to get reinforced retainers and higher pound springs?

 

[K-Saletta]

Well wouldn't coil bind happen at all rpms If it was my problem..?

 

[K-Saletta]

My cam has stock lift (mod2 dynocam) and I have stock length pushrods and stock ratio rockers

 

[Norcalputput]

Kevin I don't under stand what your trying to figure out
Yes coil bind will effect at all rpm with to much lift but your cam has stock lift and a bit more duration I don't see any problems. Did it stop running? otherwise put the chain back on and ride
Try not to rev the motor to the point the valves float or get some 28lb springs. A uncontrolled valve is a BAD thing



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[Camjamsdad]

The mod2 is fine you shouldn't have coil bind.

 

[K-Saletta]

Yes it kept running fine and thanks - so yes maybe I should get some 28s would I need to upgrade the valve train (besides springs) at all? Rockers? Pushrods? Retainers??

 

[Norcalputput]

What's your budget?


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[K-Saletta]

I'm about to buy a car so not alot, maybe like 100 on the valve train?

 

[K-Saletta]

I have a job and I am in high school so it's just I have the money but you know I don't want to spend it all

 

[Norcalputput]

Did your kart come with a tav?
I would use the jackshaft if it did
Spend the 100$ on gearing and chain you will get what your looking for TORQUE!
I would say 11:1-15:1 For a funkart


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[K-Saletta]

Yeah It did come with a jackshaft and it's in great condition

 

[K-Saletta]

Thanks for the ratios too!

 

[ludicrous speed]

Yeah It did come with a jackshaft and it's in great condition

post a pic for the jackshaft setup and the tav pieces you have.
point out which pieces r bad.
lets see if we can get you pieced back together...?

 

[Norcalputput]

No tav just use the jackshaft and the clutch you have


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[K-Saletta]

Yea I would only need one more sproket for the jack shaft to do that because it came with one on there already, I'm not sure of how many teeth it has but I will count