The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: neil parker on 22.02. 2013 23:17
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Hi, I posted a question yesterday about my A10 running rich on one side lean on the other. It is suggested that i use a biased spacer. Can anyone tell me how much to bias the spacer from one side to the other side.
I am in rural Australia so wanted to adjust (file) the one i have, before ordering one from Cake street spares. I am off to a rally in 4 days so wanted to get the bike right before then.
Neil
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G'day Neil, welcome to the forum.
It's a bugga waiting for stuff from the motherland,ain't it.
I'd go 0.5mm at a time. Rough it in with a file and finish with 400 wet & dry. I assume you have a thick (1/8" or more) tufnol spacer and paper gaskets.
4 days should give you time to try a few set ups.
Cheers
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Hiya Neil, I haven't been on board for a while, but was funny I was looking in my 'Hayes' the other day, and read the anti-induction blurb yet again and it's almost an official admission that the ports are not profiled very well, which I noticed on mine a while ago, and acted accordingly.
That was when I bought a Dremel,and utilised the profile gauge I already have, and did some 'sculpting'; ie evened up the internal profiles of in/ex ports
Not sure yet how effective it'll be but can't be too bad, I fired it up the other day for the first time in many fingers years ago, but the bottom line in my opinion is that the 'bias' is a crock of crap and just a cop out for the factory for not casting the heads well- I could be wrong, but that's me, so when you have a chance strip it down and have a check. (not much time for 4 days leadup)
cheers, duTch
I'm up in sunny/floody/?let me check? *conf* Qld
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I have dyno tuned small fin and large fin cast iron A10 engines, and they have all showed a leaner mixture on the LH pot.
Richard