CBR 600F 1987 - 1990 CBR 600F Forum

engine bogging under 5000RPM

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Old 02-08-2009, 11:16 PM
caneridah's Avatar
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Cool engine bogging under 5000RPM

Hey guys maybe someone can help me with my newest problem? I just bought an 87 hurricane 600 and when i opened it up the engine would not turn out more than 8 or 9K RPM without bogging. So I cleaned the carbs and installed larger jets (i went from #92 jets to #120 jets) and now the bike bogs upon acceleration under 5K RPM. Is there anyway to get the fuel/air mixture correct on these old beasts? or is there something else i need to do after installing larger jets?
 
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Old 02-09-2009, 09:29 AM
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odds are youre way too rich. When installing a larger main jet you need to add more air as well. (K&N and Airbox Mod)

You need to pull the carbs out again.

WHen you cleaned them did you actually take the float needle seat out? They have a filter on them that needs to be cleaned on each carb.

Did you set your float height? That controls your mix below 5000 rpm, should be set at 7-8mm (says 8 in the manual)

Fuel Mixture screws need to be set at 2.5 turns out.

Make sure your pilot jet isn't clogged.

Hope this helps.
 
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Old 02-09-2009, 05:52 PM
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That does help a lot that gives me a few more options to play with. I already have a k&n filter and drilled airbox. Thanks for your reply I'll see if that works.
 
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Old 02-10-2009, 11:40 AM
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hey no problem, one thing you will know like the back of your hand is taking the carbs out of this bike. Its a common thing to have to pull them at least once a year.
 
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