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Author Topic: lectron carby  (Read 4734 times)

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Offline dodgee

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lectron carby
« on: September 16, 2012, 11:47:32 am »
can i run a lectron flat slide carby on a pre 78 bike
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Offline Nathan S

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Re: lectron carby
« Reply #1 on: September 16, 2012, 01:32:17 pm »
Not legally.

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Offline firko

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Re: lectron carby
« Reply #2 on: September 16, 2012, 01:40:02 pm »
Quote
can i run a lectron flat slide carby on a pre 78 bike
Quote
Not legally.
Why not? They were as common as Holley double pumpers in 1976/77.
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'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

oldfart

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Re: lectron carby
« Reply #3 on: September 16, 2012, 01:59:44 pm »
the book says any type of pre 78 "ROUND  SLIDE"  may be used
18.5.5.4
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Offline firko

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Re: lectron carby
« Reply #4 on: September 16, 2012, 02:05:29 pm »
I didn't realise that was in the book Stew. Why would they put such a restriction on when the carbs were clearly available prior to '78? I agree they're not kosher for pre 75 but they definitely should be allowed in pre '78. I've tried to keep neutral on the pre '78 rule thing but when these situations arise it becomes bloody obvious that there really are some shortcomings in there ::)
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'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

oldfart

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Re: lectron carby
« Reply #5 on: September 16, 2012, 02:06:34 pm »
Unless you are reading  18.5.6.4 which pertains to evo bikes ...period flat slide and any round slide may be used
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Offline bazza

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Re: lectron carby
« Reply #6 on: September 16, 2012, 02:16:05 pm »
just talking to graham sword at C./d about electron blue carbs they ran on early bikes-just another mystry in the vmx rule book
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Offline JohnnyO

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Re: lectron carby
« Reply #7 on: September 16, 2012, 02:16:47 pm »
They were definitely around in the 70's well before the EI blue magnum which I tried in '79. The rule book needs some fine tuning.
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Offline JohnnyO

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Re: lectron carby
« Reply #8 on: September 16, 2012, 02:18:39 pm »
Bazza the blue carbs were EI's. The one I had actually came from Swordy...
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Offline Slakewell

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Re: lectron carby
« Reply #9 on: September 16, 2012, 02:26:53 pm »
Never been a fan of them myself but yeah why not pre 78?

I still say a well tuned Bing produces more power than any other.
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Offline firko

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Re: lectron carby
« Reply #10 on: September 16, 2012, 02:38:23 pm »
Quote
I still say a well tuned Bing produces more power than any other.
Without entering into a "my carby's better than your carby" discussion, I totally agree Slakey. Having said that,  I've got a drawer full of Lectron, Blue Magnum and EI flat sliders...I've got a Walbro Pumper as well and I think I could raise some proof of them being around prior to 1975 ::).
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'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline Nathan S

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Re: lectron carby
« Reply #11 on: September 16, 2012, 03:10:56 pm »
This rule was changed for the start of 2011 (maybe 2012?). I don't pretend to know the details, but it seemed pretty average to me - like the rule was changed specifically to enable an unfounded belief to be perpetuated, and to avoid the challenge from a strong, fact based case that was brewing (for the Lectrons to be allowed in pre-78).

I'd love to be wrong, but that's how it looked from my largely disinterested position.
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Offline Nathan S

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Re: lectron carby
« Reply #12 on: September 16, 2012, 08:05:05 pm »
Not unless they're round slide.

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211kawasaki

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Re: lectron carby
« Reply #13 on: September 16, 2012, 08:20:27 pm »
The reason why flat slides were not included in pre 78 was due to a lack of evidence that said anything other than the most basic version was around at the time - they became standard fit to lots of machines after that period so they were included to make them legal for the EVO and later classes.
The Commission decided not to include because it felt it was going to be difficult to prevent a modern flat slide in pre 78.
Im sure there is a thread somewhere here on the discussions at the time.
DT
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Offline OverTheHill

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Re: lectron carby
« Reply #14 on: September 16, 2012, 09:56:24 pm »
Had a [bung] Bing on my old RT1 ride to work bike. Was a 38 till the guy wanted it back[damn thought he'd forgotten it] but left me with a 36 with one float missing off the arm which made no difference at all--ie no flooding etc, no difference except was a tad rich on the needle due to rich mx type jetting, fitted a leaner needle jet & think it's on my DT1 GYT cylinder [LA sleeved] YZ250A cased, DT1 cranked, bitsa gearboxed, landscout tanked--ohh that's enough. No wonder my boys won't be seen near it if someone's taking a photo. Anyway--still like the 36 Bing & the slide never sticks like the old DT trail anodised slides in the wet if moisture gets in. Remember my DT1 GYT kit carb sticking on methanol [purple shell racing spirit special 'alky'] as i was running the oil which i think was 'shell super-heavy' [like a thick castrol R] through the oil pump but was ok once i mixed it in the fuel instead to help lube slide on the way in but used to separate on a cold [nz] day, not sure if i knew about [is it] acetone!! back in those days. Sorry where was i---Go the Bings!!. Thanks. ps, had a 'Blue Magnum' on a yz125H at one stage. Was ok but i was always playing with it [carb!! that is] to keep it constant & seemed to alter at will. Was ok on full song though but have to slow down sometime. Think it was that type carb--did they have a flat sided tapered slide needle? & bowl held on by a clip--dunno too long ago.
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