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Savage 4.6 fuel starvation?

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davetfft

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I'm a newbie so bear with me... I've got two Savage X 4.6 with similar problems. They start & idle well and most of the time they'll rev and produce the power you'd expect, However once in a while they bog down and sometimes die when the throttle is opened quickly. It seems like it's a fuel starvation issue but I'm not sure, any ideas?

I've watched the tuning videos numerous times and it seems the HSN has no affect on this btw...

I've replaced the header gaskets, springs, fuel lines, cleaned the carbs and replaced orings as necessary.

Thanks!
 
Read the tuning tips and tricks at the top of the nitro forum. Sounds like you may have air leak issues. That sticky explains sealing in detail. Also, what's the ambient temperature? If it's below 45-50 degrees, tuning can become a nightmare. What are the engine temps? You may just be lean on the lsn. Make sure the tank cap is sealing properly as well.
 
Metalhead Matt said:
Read the tuning tips and tricks at the top of the nitro forum. Sounds like you may have air leak issues. That sticky explains sealing in detail. Also, what's the ambient temperature? If it's below 45-50 degrees, tuning can become a nightmare. What are the engine temps? You may just be lean on the lsn. Make sure the tank cap is sealing properly as well.
Click to expand...

I'll do that thanks...

I thought it was an air leak as well thus causing apparent fuel starvation however everything that 'could' leak has been replaced short of the exhaust pipe itself and the gas tanks (which appear ok). I've ordered a new tank to experiment with so we'll find out if I've got a leaking primer plunger or oring seal.

Now I am playing in the snow, below 30 degrees, so that could be part of the issue....

Haven't checked the engine temps, what engine temperatures are considered normal operating range (fully warmed up etc)?

Thanks for the tips!
 
240-270 are common temps. Every engine is different though. O-rings and gaskets need a little high temp rtv to help them out sometimes. Running in the cold is very hard on the engine if the temps aren't where they're supposed to be. You may find that your in need of a rebuild once the weather warms up. Some folks keep a half way worn out engine around for winter use. The cold contracts the metal, adding a lot of stress to the internals. Covering a few of the cooling head fins and richening up the mix may help you out.
 

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