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Post by kawonda750 on Jan 11, 2019 15:14:35 GMT -5
I have been told by one of the guys who knows that changing the carb slide on the 72 H2 to a 2.0 from 2.5 will greatly help with the surging. I ordered slides from Dime City which they claim are for VM 30 -34. They are too big. Mine measure 31.5 mm approx diameter and theirs are 35.5. Heights are the same at 41 mm.
He claims these are correct but obviously not. Can anyone cast some light on the proper 2.o from Mikuni?
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Post by Curtis on Jan 11, 2019 15:18:13 GMT -5
I think the stock Mik carb for the H2 is a different VM series this a different slide....
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Post by kawonda750 on Jan 11, 2019 15:40:26 GMT -5
It is listed as VM30 SC
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Post by autofobe on Jan 11, 2019 19:34:27 GMT -5
Hey Dave,Welcome to the surging world of the H2.Don't be to quick to sell the grey. Better men have tried to stop the surge.The best way seems to be with bigger carbs & pipes but if you want it stock you will have to live with it.A perfect tune will ease it a little.Just don't lug it around.Drop a gear and keep the revs around 4 grand. As far as the slides go you,you need slides for 30's not the 34's you have. If you cant find any you could always take a couple of mm's of the flat part of your slides to make the arch shorter.
Brad
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Post by zambia on Jan 12, 2019 11:20:31 GMT -5
I agree with Brad. The surging is hard to dial out with the stock 2.5 slides..and it depends fully on all other factors: pipes, air filters, porting...and then the jetting. The 2.0 slide, being richer is the best option for a good tuning base. The slides you got are clearly incorrect - I know the ones André has will fit your carbs, but the pin in the carbs will not fit the groove..so you have to pull the pin out, file a tiny bit off and then reinstall it - bam, you're in business. This will only matter if André gets more in stock..or you can find the part number elsewhere.
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Post by tankie on Jan 13, 2019 8:40:02 GMT -5
I managed to get some 2.0 slides from my U.K supplier, Motocarb it definitely make the tuning a lot easier I have had these fitted for a couple years now
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Post by kawonda750 on Jan 13, 2019 9:36:29 GMT -5
Do you have a Mikuni part number Tankie?
Does anyone else??
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Post by tankie on Jan 14, 2019 4:17:56 GMT -5
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Post by kawonda750 on Jan 14, 2019 8:47:53 GMT -5
Are these for the stock carbs or for 34's?
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Post by tankie on Jan 14, 2019 9:28:36 GMT -5
they are for vm 30's according to Mikuni's parts diagram on the Motocarb site
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Post by kawonda750 on Jan 14, 2019 12:55:00 GMT -5
It seems that these slides are unobtainium. Does anyone have the spec to cut the stock ones down?
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Post by shiloh on Jan 14, 2019 13:16:05 GMT -5
There are virtually no NOS original parts avail for these old carbs any more, besides those hoarder who occasionally bring some out for sale and basically name the price.1 gazzillion$ for 1 jet needle F that....! And yes they are/were made from un-obtainium cause mother kawi knew.... I gave up a couple yrs ago and just went after market. Makes life easier.
Oh and very few if any reproduction parts are correct, maybe the screws that hold the bowls on and that`s doubt full. Just ranting Dave, sorry, I don`t have the measurements, But I`ll bet someone does.
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Post by tankie on Jan 14, 2019 13:31:25 GMT -5
If you have the original brass slides you could just lessen the cutaway by adding a layer of solder to the apex of it, the original height of the cutaway is 4.06mm ,so you need to add 0.81mm to lower the apex of the cutaway so the height will become3.24mm
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Post by kawonda750 on Jan 14, 2019 13:46:48 GMT -5
I am a little nervous about adding something that could come loose and get sucked into the engine.
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Post by lc on Jan 14, 2019 13:50:20 GMT -5
The mikuni units of measure that determine slide CA are 1/6ths of an inch. (based on Amal's carbs)
As such if you place a 2.0 slide on a flat surface the edge of the cutaway will be two 16ths (.125in) above the flat surface.
Perhaps you can machine .032 off the bottom of your 2.5 slide?
This alone might be sufficient for what you want.
After the bottom is cut .032in, to get it to be the same as a real 2.0 slide the existing cut will need to be re-angled to meet the bottom surface at the same location it is before the cut.
J
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