Possibly icing of the engine intake might be the problem. It isn't likely when humidity is very low but when the air is damp and cold icing is likely. This is especially so where a carburettor is used.
Manufacturers mostly make some provision for heating the intake and/or the incoming charge of air but to maintain performance the charge must be kept as cold and dense as possible so the provision for heating is not substantial and might just be the positioning of the intake close to the exhaust or a hot and shaded part of the engine.
Sometimes the provision is rather more sophisticated using flaps controlled by vacuum servos and temperature sensitive devices.
The fuel tank breather might also be blocked or partially blocked.
M7 05 won't rev out properly [Archive] - SnoWest Snowmobile Forum
www.snowest.com/forum/archive/index.php/t-331581.html
Dec 30, 2012 - 27 posts - 11 authors
[Archive] M7 05 won't rev out properly Arctic Cat: M Series. ... So I put the proper weights in my m7 and now it won't pull rpms. It's seems .... Well it will rev to 7500-8000 at 6k ft with just the primary clutch. You can see and hear the servo open. With the track on it would rev to 7500 but then fall to 6800-7000.
2008 M8 wont rev over 6,000 RPM
52 posts
Dec 23, 2013
M8 Not reaching full RPM's and It's not the clutching!
79 posts
Feb 12, 2012
M1000 Limp mode HELP!!!!
25 posts
Dec 30, 2010
03 F-7 Arctic Cat EFI Snow Pro (HELP)
7 posts
Jan 5, 2009
More results from www.snowest.com
293 views
Usually answered in minutes!
×