220SR derestriction

Non-American model KDX's
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AndrewB
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220SR derestriction

Post by AndrewB » 01:49 am Jun 02 2018

Big thanks to all on the forum for the useful tips and advice (especially cornishwrecker220 for the repeated posts recommending 35mm carb and starting point for tuning (40, 152, 1173L).

220SR now converted - bit of a mission but result is road legal 220 at pretty much full spec, so well pleased.

For the record, the conversion needed new intake side all the way - new airbox, new carb boots, reed block ported out to match profile of inlet manifold.

Started with 33mm pwk, and (following jetting guide) finished up with 42 pilot, 148 main and CGJ needle, middle clip (sea level, 10-15 degrees C).

Then on to 35mm - got to 40 pilot, 158 main, still using CGJ - good up top , but too rich in low + midrange (sluggish until powervalve opening) - revert to 1173L - WOW!

Found the 1173 to be very flat in 33mm carb, but perfect for 35. Great low range control, snap wheelies, top end with smooth transition. 80mph top (13/46 gearing, which is more or less stock) - would probably do a bit more, but need to get forks done for that!

Thanks again guys - forum tips invaluable help

cornishwrecker220
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220SR derestriction

Post by cornishwrecker220 » 09:04 am Jun 02 2018

Good to hear you've sorted your SR ....if you ever feel the need for even a little more power then a head & port job works well on the 220. :grin:

jhogg7575
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Re: 220SR derestriction

Post by jhogg7575 » 01:33 pm Oct 13 2018

Do you still have the 33 mm carb and it it for sale

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jhogg7575
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Re: 220SR derestriction

Post by jhogg7575 » 01:43 pm Oct 13 2018

Just looked at your other posts and see that your n NZ as a rugby fan I would like say you lucky Basxxxd. I will look closer to home for a larger carb. If you see my uncle Harry there say hi form Scotland [emoji16]

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AndrewB
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Re: 220SR derestriction

Post by AndrewB » 01:37 am Mar 12 2019

Hi jhogg7575 - sorry for VERY late reply! Having derestricted my SR, I promptly pranged it and mashed up my leg pretty bad - hahaha! that'll teach me! (WARNING! -don't wear grippy soled boots on the road - I touched a foot down to correct a wobble - foot stuck to road - I ran my own leg over! Doh!!)

Re the carbs - to be honest its not worth me posting it - I bought both the 33 and 35 cheap as chip from chinese vendors on aliexpress - they both work just fine.. The 33 I'm pretty sure is the real mccoy and cost about $120NZ (60 quid), the 35 (from a different ali vendor) cost about $80 and looks like it's a reconditioned original. Both work just fine. I did buy original Keihin jets so I could be sure of the sizes.

Re the rugby - the b***gers put it all on Sky and live tickets cost a fortune so not much better off! Nice country though :-)

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KDXGarage
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Re: 220SR derestriction

Post by KDXGarage » 09:02 am Mar 12 2019

Sorry to hear of your mishap!
kdxrider.net forum member doakley participating in National Enduro series:
(current class standing, 5th!)
viewtopic.php?f=136&t=23217&sid=e6a86d8 ... 9&start=40

Thank you for participating on kdxrider.net. :bravo:

AndrewB
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Re: 220SR derestriction

Post by AndrewB » 02:24 pm Mar 15 2019

Thanks KDXGarage - it's a bit of a b****ger 'cause its the right leg and it'll be ages before i can cope with the kickstart again :-(

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