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2 stroke twin electronic ignition system

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andyday271
L Plate Warrior



Joined: 14 Sep 2021
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PostPosted: 12:29 - 14 Sep 2021    Post subject: 2 stroke twin electronic ignition system Reply with quote

Hi All, Newly signed up hoping for a little help. I have a73/74 Gt250 barn find project which I aim to club race, I have stripped completely as engine was seized and rusted after being left in a shed for 20 years, I have re-built the engine and gearbox and modified it to run on pre-mix removed oil pump and kick start baffled pre-charging chamber blocked off all oil ways in caseings - I'm looking for help with the ignition system looking to get electronic poss cdi or Ecu has anyone made this mod on a 2 Stroke twin any ideas welcomed, Many thanks Andy.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 13:33 - 14 Sep 2021    Post subject: Reply with quote

Usually very simple because they don't have an advance curve. Two main types. One of them replaces the points with a pickup that you dial in the timing on. Generally a trigger that you fit in polace of the points cam and a hall effect sensor that produces the spark in response to the trigger.

The other sort is integrated and replaces the whole charging system with the ignition integrated into it.

You usually need a kit specific to your bike unless you're good at fabricating the bracketry to attach the pickup and trigger.

I have experience of vape systems, these are very good. High output generator and integrated points. Looks like they make one for your bike. Not cheap.
https://www.vape.eu/suzuki

EDIT: Just noticed you're racing it, so no charging necessary, the race ones are a bit cheaper because they are spark only. Elextrex also do a race system for them.
https://www.electrexworld.co.uk/cgi-bin/sh000001.pl?WD=gt250&PN=STK%2d250%2ehtml#SID=942
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 13:55 - 14 Sep 2021    Post subject: Reply with quote

A Zeeltronic might be worth a look, you can map it and they are well regarded.

When you say you've blocked off the oil ways in the casings... is that a good idea? I personally would rather run a pump than premix unless I REALLY knew what I was doing too... if you can get the fuelling right with premix then that's OK... but it's not straightforward as premix will make the fuelling a bit lean so you need larger jets to accomodate the fuel AND the oil.. and I'd be concerned that the oilways in the crankcase target specific parts in the bottom end. This might be nothing but I have no idea.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 14:13 - 14 Sep 2021    Post subject: Reply with quote

pretty sure Blau races a 350 one.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 14:33 - 14 Sep 2021    Post subject: Reply with quote

MarJay wrote:
I'd be concerned that the oilways in the crankcase target specific parts in the bottom end. This might be nothing but I have no idea.


This is a good point, don't suzuki use sleeved cranks on some models? So the main bearings are directly oiled?
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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A100man
World Chat Champion



Joined: 19 Aug 2013
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PostPosted: 22:50 - 14 Sep 2021    Post subject: Reply with quote

stinkwheel wrote:
MarJay wrote:
I'd be concerned that the oilways in the crankcase target specific parts in the bottom end. This might be nothing but I have no idea.


This is a good point, don't suzuki use sleeved cranks on some models? So the main bearings are directly oiled?


Correct both. You can't run a GT250 on Premix as there's direct feeds to the crank bearings..

It might last one race though Wink

WRT ignition I read one guy who had made his own stator plate to mount the bits form a fiat 500 pointless Hall-effect system - didn't look that tricky and only about 30-40 quid
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redeem ouzzer
World Chat Champion



Joined: 06 Oct 2015
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PostPosted: 06:13 - 18 Sep 2021    Post subject: Reply with quote

You can’t run any Suzuki 250 twin pre X7 on premix without a lot of modification to both the cases and crank webs to encourage intake charge to flow to the main bearings. If you’ve just removed the pump and blanked off the lines expect frequent crank failure.

As regards ignition, it’s not 1973 anymore, you really want a programmable curve to make a tuned engine perform properly.
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