Operation at 4,000 ft. above sea level

05 Honda CRF 150 F discussion forum:


Operation at 4,000 ft. above sea level

Operation at 4,000 ft. above sea level 
Cliff said 2012-05-12 03:19 
 
I have a 2003 CRF-150 that was bored out for 175 CC displacement in 2005. All other engine components remained factory stock. Problem: The engine starts and operates very well at sea level (San Jose, CA.)I do some woodland riding at higher elevations from 3,400 ft. to 4,000 ft. above sea level. At increased altitude the engine is very difficult to start only, however operates well once running and warmed. I suspect There is a carb jet mismatch issue for the intended higher elevation operation. Is a jet replacement to a smaller size jet for leaner operation at altitude easy enough for garage mechanic like myself to acccomplish? What reduced carb jet size should I purchase from Honda inventory? Thank you, Cliff 
 
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