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Expansion chambers (Higgspeed) fitted on SuzukiGT250B

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Graham Thomas
L Plate Warrior



Joined: 22 Nov 2020
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PostPosted: 21:37 - 22 Nov 2020    Post subject: Expansion chambers (Higgspeed) fitted on SuzukiGT250B Reply with quote
Has anyone else experienced the low end to mid range power reduction after fitting expansion chambers ? I believe I maybe need to increase the primary and main jet size and any pointers would be useful. I've tried lifting the needle a notch and didn't make much difference.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 00:54 - 23 Nov 2020    Post subject: Reply with quote
Can't be specific to your bike but in general, performance spannies on a 2t give you more top-end at a cost of midrange. The more top-end, the less midrange and without dynamic exhaust ports, that's what you'll be stuck with.

Needle profile, needle jet and slide cutaway, needle position and the relationship between them will be the main factors determining your low to mid range.

Slow running jet is only really a factor from idle to about 1/4 throttle opening. Main jet will be about 3/4 to wide open.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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redeem ouzzer
World Chat Champion



Joined: 06 Oct 2015
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PostPosted: 11:05 - 23 Nov 2020    Post subject: Reply with quote
LOL Higgspeed.

Those are pretend chambers for those that like shiny things and making silly noises rather than those of us looking for big power.

At the moment you are guessing regarding the apparent lack of low and midrange and it being attributable to the AFR being wrong.

You really need to get the bike on a Dyno.
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A100man
World Chat Champion



Joined: 19 Aug 2013
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PostPosted: 13:48 - 23 Nov 2020    Post subject: Re: Expansion chambers (Higgspeed) fitted on SuzukiGT250B Reply with quote
Graham Thomas wrote:
Has anyone else experienced the low end to mid range power reduction after fitting expansion chambers ? I believe I maybe need to increase the primary and main jet size and any pointers would be useful. I've tried lifting the needle a notch and didn't make much difference.


Are you suggesting that fitting these pipes has had a detrimental effect on performance?

Higgspeed (AllSpeed?) are still operating aren't they? Can't you approach them for some guidance.

Failing that ride about a bit, if you hole a piston - too lean.
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redeem ouzzer
World Chat Champion



Joined: 06 Oct 2015
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PostPosted: 15:04 - 23 Nov 2020    Post subject: Re: Expansion chambers (Higgspeed) fitted on SuzukiGT250B Reply with quote
A100man wrote:


Higgspeed (AllSpeed?) are still operating aren't they? Can't you approach them for some guidance.

Failing that ride about a bit, if you hole a piston - too lean.


Higgspeed is a totally different company selling their own pipes. Variations on the old Allspeeds are sold via Gibson.

Common denominator is they are both shite compared to purpose made chambers.
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A100man
World Chat Champion



Joined: 19 Aug 2013
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PostPosted: 15:17 - 23 Nov 2020    Post subject: Re: Expansion chambers (Higgspeed) fitted on SuzukiGT250B Reply with quote
Forced wrote:


Higgspeed is a totally different company selling their own pipes. Variations on the old Allspeeds are sold via Gibson.

Common denominator is they are both shite compared to purpose made chambers.


Ah gotcha Thumbs Up
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600
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Old Thread Alert!

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