glow plugs?

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When I ws running my stock F4.1 I started running with the HPI R4 I believe. Then switched to a Duratrax LR3 hot plug as they were like $2.52 at LHS but now have gone up and I have switched to 30% and different motor's. I have great luck with Racer Edge Plugs I typicaly run #4's now.
 
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in my savage x 4.1 it came with a r4 i believe and thats whats still in it, i think the r4 is a medium/cold plug and i haven't had any problems
 
i use O.S. 8 i bought up what SMF had left in stock. i think they were around the $3.25 range. they still have other brands in stock. the novarossi plugs are on sale. then they have the HPI and McCoys aswell
 
McCoy MC 8's are a great plug, that's what I've been running for years with no real issues. MC 9's are a good choice for 30%+ nitro, or if you remove a head shim, they are a cold plug.
 
The OS 8 is a short plug, it will reduce the compression ratio and the engine will give a little less power.
 

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