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Post by nicearris on Jan 5, 2014 15:16:03 GMT
Depends on the carbs you will be using. I put a DOT head on a B12 and used the 38mm carbs and when the rubbers were first bolted to the head they look like this. (38mm GSXR750L Rubbers)
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Post by nicearris on Jan 5, 2014 16:37:03 GMT
So bolt on all the inlets rubbers, mark up where the step is, and then out with the high speed cutters and get cutting. NOTE- there will be steps "out of wind" in the inlet rubbers so they need trimming as well. I'm assuming this will also need doing if your using standard B12 rubbers on the DOT head.
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Post by nicearris on Jan 5, 2014 16:43:14 GMT
Bit off the head, bit off the inlet rubber and it should look summat like this. OH and as for the ignition advancer, just try it with one and then the other to see what you prefer. Probably wont notice much difference but i would guess that the standard one would work best as your compression ratio has increased and your mixture will be burning faster.
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coco
Oviraptor
Posts: 9
Bikes: Suzuki bandit 1200 Honda Cb 900f2c Yamaha RD250e
Reg: Jan 4, 2014 20:09:54 GMT
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Post by coco on Jan 6, 2014 22:34:13 GMT
Cheers , the part no on the rubbers look the same as the ones that were on the head when I got it. Got another set coming now. I did mark around the inside of the port and machined out as required but was only out a tiny bit. Rubber matched perfect at top. I bought the head of a guy who raced gsxr's so maybe it had been doe a bit. Valves all seated good now so almost ready to reassemble head. Will try and get a couple of photos up later in week. Honed barrels and made up plates to cover air bleed ports tonight on newer barrels I'm going to fit at the same time.
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gombur
Velociraptor
Posts: 29
Bikes: -98 Bandit 1216, -83 Moto Guzzi V35 MKII
Reg: Aug 25, 2013 21:15:49 GMT
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Post by gombur on Jan 7, 2014 14:31:01 GMT
Bit off the head, bit off the inlet rubber and it should look summat like this. OH and as for the ignition advancer, just try it with one and then the other to see what you prefer. Probably wont notice much difference but i would guess that the standard one would work best as your compression ratio has increased and your mixture will be burning faster. I'd prefer "Poor man's ignition advancer". Fully adjustable and cheap I had this pic in depths of my pc. Don't know the origin of it. Timing plate is a bit different but you'll get the idea.
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Post by captain chaos on Jan 7, 2014 14:59:10 GMT
one mm at the edge of the plate equals 1 degree (roughly)
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Post by nicearris on Jan 7, 2014 16:08:40 GMT
I prefer the "cheaper" option too ( I am Scottish!! ) but Coco already has a 5 degree advancer so he could probably try the advancer and the standard rotor on a back to back test, see whats best then slot the backplate and ebay the advancer!!
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