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Hi every one, I just bought a 2003 400EX bored to 426 and notice that it’s missing the decompressor lobe on the camshaft. I was wandering if it would still start or I need to buy the lobe. Thanks in advance!! Also, what main jet should I be running? The engine is bored to 426 like I said, it got a FmF powercore 4 slip on on it.
TIA.
 

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It probably has a high lift cam in it in which case the cam lobe is taller than the decompressor lobe, so the decompressor is eliminated. When you buy a modified engine, get the history and receipts. You need to know what was done, who did it and that specifications were used during the build.

Just a word of advice, you have to have a special head gasket if you tear it down - Cometic C7826 for 88 and 89 mm bores. All other gaskets will be stock.
 
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