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Yorkie
Settled In Member
United Kingdom
62 Posts |
 Posted - 17/11/2007 : 17:52:00
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had my superfour up on the dyno today i am quite impressed with the results except for the huge lean spike around 6k :/ makes 51bhp at peak :)
anyone know a way of quick way of fixing it?
guy at the dyno said to raise the clip on the needle and if that doesnt fix it to look for an electrical problem
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Edited by - Yorkie on 17/11/2007 17:52:57 |
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BUGIE
Regular Member
Malta
505 Posts |
Posted - 17/11/2007 : 19:33:22
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nice result there. Do you have any mods on the bike???
Also what year is the bike? |
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Yorkie
Settled In Member
United Kingdom
62 Posts |
Posted - 17/11/2007 : 20:32:20
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| its 95 project big one, only mod is the rear pipe, standard downpipes with hindle stealth slip on exhaust other than that no mods |
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BUGIE
Regular Member
Malta
505 Posts |
Posted - 17/11/2007 : 22:14:50
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| was the hindle slip on specific for the CB400sf or another bike? |
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Yorkie
Settled In Member
United Kingdom
62 Posts |
Posted - 17/11/2007 : 22:20:31
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| was for another bike, but the flatspot was there before hand, i can remember the sudden surge of power when i reached 6.5k on the standard pipes as well as the ones that were on it previously in all respects its not that noticeable through the rev range :P |
Edited by - Yorkie on 17/11/2007 22:21:58 |
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BUGIE
Regular Member
Malta
505 Posts |
Posted - 17/11/2007 : 23:03:04
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yeah i notice a sudden surge of power at 6.5/7k on my Cb400sf with standard pipes. the same is also true on my mates Cb400sf so i think it's characteristic of the bike..
When you say for another bike, do you know what model it was for as i'm trying to find a slip on can for mine and don't know what i should look for when buying exhausts |
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Yorkie
Settled In Member
United Kingdom
62 Posts |
Posted - 18/11/2007 : 14:38:12
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| it was originally for an R1 i believe, 52mm bore, standard pipes were cut just after the the part where it bolts on under the footpegs and had a link pipe made up for it, exhaust was cut down as well. |
Edited by - Yorkie on 18/11/2007 14:40:09 |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 28/11/2007 : 02:27:36
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That lean/flatspot is present on many Hondas at those particular revs.
It's hard to eliminate it entirely, but you can minimise it a great deal by simply inserting a 0.5mm washer under each carb needle. This will slightly richen the mixture up at mid-revs only.
Your bike is also a bit lean at 10-11k rpm, new main jets that are one size bigger will fix that. With the above washers it will greatly improve the feel of the bike.
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I DUG the underground! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 28/11/2007 : 02:29:18
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quote:
Originally posted by Yorkie
anyone know a way of quick way of fixing it?
guy at the dyno said to raise the clip on the needle
Oops just saw this bit.
You'll need to be raising the needle, you do this by lowering the clip (you can use washers if it doesn't have clips). |
I DUG the underground! |
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Yorkie
Settled In Member
United Kingdom
62 Posts |
Posted - 28/11/2007 : 19:49:45
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| cheers for that, will have a better look when the weather gets a bit better |
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gothy
Settled In Member
United Kingdom
52 Posts |
Posted - 09/03/2008 : 10:09:33
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I've got an R6 scorpion can on mine.
But before that I had a full WRS exhasut system, i just swapped the cans over.
When we have the dyno set-up i'm going to be testing my superfour. |
Honda CB400SF 1995. |
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Superfour on the Dyno
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