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Mr White
Renault 5 Driver



Joined: 23 Aug 2009
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PostPosted: 09:41 - 21 Aug 2010    Post subject: Need info about restricting a bike Reply with quote

I am only 20 years old and I am planning to buy a Hyosung GT650R or Suzuki SV650. Thus whatever I buy I will have to get restricted down to 33bhp.

I have seen some restriction kits(washers) for SV650 on ebay, for £30.

However the only GT650R restriction kits I could find are the ones on FI international website and cost £200.

There is £170 difference, hence my next question Mr. Green


GT650and SV650 have not the same but similiar engines. (GT650 has 10bhp more)
However they have the same carbs.

If I fit a SV restrictor kit on a GTR will it produce 33 or 43ish bhp (as it has 10 bhp more as standard).

Can this be further corrected with a smaller jet and a smaller hole in the air box?
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woll
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PostPosted: 10:27 - 21 Aug 2010    Post subject: Reply with quote

I think the sv650 are restricted by the ecu, so i'm not sure if it will work. Just don't restrict it Laughing
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ram_doom
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PostPosted: 11:40 - 21 Aug 2010    Post subject: Reply with quote

If your sv/hyosung is carbed, nicky-jano on here has some 33bhp restrictors going cheap Razz
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MarJay
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PostPosted: 12:04 - 21 Aug 2010    Post subject: Reply with quote

woll wrote:
I think the sv650 are restricted by the ecu, so i'm not sure if it will work. Just don't restrict it Laughing


For an injected SV it can be restricted by the ECU yes. But it can also be restricted with washers, and the carbed one has to be restricted with washers.
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woll
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PostPosted: 12:31 - 21 Aug 2010    Post subject: Reply with quote

Ah i see, learn something new everyday Thumbs Up
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Devans
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PostPosted: 12:36 - 21 Aug 2010    Post subject: Reply with quote

My mates SV 650 04 plate has washers an a throttle stop.
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m0l0t0v
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PostPosted: 12:38 - 21 Aug 2010    Post subject: Reply with quote

MarJay wrote:
woll wrote:
I think the sv650 are restricted by the ecu, so i'm not sure if it will work. Just don't restrict it Laughing


For an injected SV it can be restricted by the ECU yes. But it can also be restricted with washers, and the carbed one has to be restricted with washers.


I've seen a few carb'd Hornets restricted by washers AND CDI... Have to remove both, if you leave the CDI chances are it wont rev past 5-6k or so.
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Paulington
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PostPosted: 13:00 - 21 Aug 2010    Post subject: Reply with quote

My SV650 is a washer in the inlet manifold and a throttle stop. Thumbs Down!
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Mr White
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PostPosted: 13:35 - 21 Aug 2010    Post subject: Reply with quote

Im looking at quite old 99-00 SV650
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m0l0t0v
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PostPosted: 14:25 - 21 Aug 2010    Post subject: Reply with quote

BLUEX5 wrote:
Paulington wrote:
My SV650 is a washer in the inlet manifold and a throttle stop. Thumbs Down!


That'll be quick then Laughing


I thought that was a mod to make it faster/more exciting? Thinking
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**\Tarmacsurfer/** said: It's that immaculately manly coiffure of yours isn't it. One glimpse of your virile locks and the punters can't wait to buy whatever it is you suggest, as it might let them be just a little bit like the Adonis that is our very own Molly Very Happy Doovydoo said: Its not my fault I can't get it up properly, I just wasn't blessed Wink
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radical
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PostPosted: 16:07 - 21 Aug 2010    Post subject: Reply with quote

Op, I dont think the GTR has carbs althought the earlier models did, I havent had to restrict a bike before but surely a bike could be restricted by simply backing of the throttle cables which would prevent the bike making its maximum power or is there a lot of paperwork needed to confirm the horsepower limit?
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Scythe
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PostPosted: 16:44 - 21 Aug 2010    Post subject: Reply with quote

ram_doom wrote:
If your sv/hyosung is carbed, nicky-jano on here has some 33bhp restrictors going cheap Razz


Where? Need some myself for an 2001 SV
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Kickstart
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PostPosted: 17:32 - 21 Aug 2010    Post subject: Reply with quote

Hi

Suspect that using SV restrictors would give you within a gnats of 33hp. However if it uses a throttle stop as well as the washers then probably a bit different, and a cdi swap would probably be impossible.

radical wrote:
I havent had to restrict a bike before but surely a bike could be restricted by simply backing of the throttle cables which would prevent the bike making its maximum power or is there a lot of paperwork needed to confirm the horsepower limit?


No paperwork required at all, but to lose ~40hp you would only need a tiny bit of throttle travel left, which would mean running the cables very slack.

All the best

Keith
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Mr White
Renault 5 Driver



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PostPosted: 17:39 - 21 Aug 2010    Post subject: Reply with quote

radical wrote:
Op, I dont think the GTR has carbs althought the earlier models did, I havent had to restrict a bike before but surely a bike could be restricted by simply backing of the throttle cables which would prevent the bike making its maximum power or is there a lot of paperwork needed to confirm the horsepower limit?



07 GT650R I was looking at had carbs
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ThoughtContro...
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PostPosted: 18:05 - 21 Aug 2010    Post subject: Reply with quote

Mr White wrote:
Im looking at quite old 99-00 SV650


The 99-02 "curvy" models are the carbed ones. In addition to washer restriction kits there are official Suzuki restriction kits for them (Suzuki part no. 13501-20F50). This is a replacement carb piston, you'd need two. It's shown in this link

https://www.sv650.org/sv_faq.htm#How_to_de-restrict_a_Mk1_SV_

https://www.sv650.org/derestriction/derestrict_SV650K2_step12.jpg

The restricted item is the top one in the pic, note the small hole.

You could probably find both types of restrictor on ebay fairly frequently or ask on the forum at sv650.org

The Hyosung looks a nicer bike, especially in red. Parts are likely to be more expensive and harder to source cheaper parts second hand.

The SV is more common, parts are easily available second hand, so if the worst comes to the worst you probably wont have to wait too long or spend too much money on repairs. If you are restricting then you wont be using any extra power available in the Hyosung, unless the restrictors accidentally fall out Mr. Green

You'll probably curse the SV when you try to change the front spark plug tho
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Paulington
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PostPosted: 20:47 - 21 Aug 2010    Post subject: Reply with quote

BLUEX5 wrote:
Paulington wrote:
My SV650 is a washer in the inlet manifold and a throttle stop. Thumbs Down!


That'll be quick then Laughing

Whilst it will touch 100-110mph indicated (so a real 90-102mph or so), it gets there like a fudgin' snail. Laughing!
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CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.
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