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Discussion Starter · #1 ·
I bought this little cb175, all original, about a month ago not running. Cleaned everything, re jetted the carbs from 98-38 to 90-35. Bike had spent its life at sea level, but I live at 5000ft elevation, idle is great, 1st, 2nd, 3rd gear are smooth at all rpms. Uphill or flat ground when you shift to 4th or 5th, there simply is nothing there and you have to go back to third. 45 mph in third gear, then immediate loss of speed when you shift to 4th. Suggestions?
Thanks!
 

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It could simply be running too lean, put the 98 jets back in it.
What color are the spark plugs?
 

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Spark advance unit possibly stuck?, put a timing light on it to see if it advances properly.
 
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