New top end on bottom end, very low sound to exhaust

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SpecializedMountainMoto

SpecializedMountainMoto

Member
May 28, 2014
208
25
18
Scottsdale, AZ
I recently put a new top end on a used bottom end that I bought here in the swap shop, the piston is the same type and it is not hitting the plug or anything like that, but I have noticed it has a very deep exhaust tone way different than my other engine (gt2b) and is very slow to rev out. Anyone have any ideas why this may be? I already checked to make sure piston is not backwards (ring guides toward the carb)
 
maniac57

maniac57

Old, Fat, and still faster than you
Oct 8, 2011
4,484
22
0
memphis Tn
Pull the intake and see if the piston is blocking the port at bottom dead center.
I've seen a couple engines that needed the piston skirt trimmed to allow flow into the bottom end at BDC. Might be your issue because of the slow revving.
 
Greg58

Greg58

Well-Known Member
May 1, 2011
5,353
2,575
113
65
Newnan,Georgia
If you have a new piston, rings and cylinder how many miles do you have on it? It could just need a little more break in time.
 
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