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Mechanics 101 Can't get it to run right? Find a trick to add HP?
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Old 09-17-2017, 09:46 PM   #1
aussie7
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Question Runs Rough Over 4000rpm

Ok, I did a bit of a search and have come to the conclusion the carbs are at fault

Bike is a 06 750 gsxf (katana) with 72,000k's

Problem is the engine is smooth on acceleration from 2500rpm to 4000rpm through all gears

But when you go over 4000rpm in all gears, the bike runs rough

Do I need to get the carbs cleaned, balance or something else ?

TIA
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Old 09-17-2017, 10:19 PM   #2
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Cleaned.... since the main jet starts to come in at 3000 rpm, I'd suspect clogged mains or slide issue.
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Old 09-17-2017, 10:38 PM   #3
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Cleaned.... since the main jet starts to come in at 3000 rpm, I'd suspect clogged mains or slide issue.
thanks for the quick reply, now how much will this cost
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Old 09-18-2017, 03:16 PM   #4
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If it's just a clogged main...$10 for cleaner... Very easy to do yourself. Remove carbs from bike, remove mains from carb, soak in cleaner, reinstall, reinstall carbs, sync carbs, ride on
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Old 09-18-2017, 05:01 PM   #5
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I would also check float levels while in there if you decide to do it. The floats can bounce over time and adjustment can change.

Or drop it off at a shop, last time I checked a carb clean was around 250.00 but that was a while back.
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Old 09-19-2017, 06:28 AM   #6
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thanks everyone for the replies

I'm taking it to the shop, cost is $110 per carb or one hour per carb for cleaning and everything else involved.

I don't have the time or know how to do it myself.
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Old 01-12-2018, 04:54 AM   #7
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just for an update, I didn't get the shop to clean the carbs, instead I used a few tanks of BP Ultimate and revved the engine over 4000 rpm in top gear at 100 km/h and that cleaned out the carbs
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Old 01-12-2018, 08:35 AM   #8
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just for an update, I didn't get the shop to clean the carbs, instead I used a few tanks of BP Ultimate and revved the engine over 4000 rpm in top gear at 100 km/h and that cleaned out the carbs
if that worked im no pro but i would say it was something stuck, because if it was anything clogged in the Jets there is no way it would clean itself with any kind of fuel additive.
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Old 01-23-2018, 11:55 PM   #9
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if that worked im no pro but i would say it was something stuck, because if it was anything clogged in the Jets there is no way it would clean itself with any kind of fuel additive.
I'm not sure how they got unclogged and the only idea I have is it was due to the fuel additive ?
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