I've been looking for such baselines but haven't come across any in my searches. Where can I find these, or what is the baseline? Additionally, are there timing modifications needed or is the stock 38 degrees still pretty much right?Yes and jetting baselines are available for the VM34's on 750 kitted XS's Genuine Mikuni, no Chinese knock offs or snowmobile carbs with 2 stroke internal part$.
Hey Manny, without necessarily having any immediate BBK experience, if your wife's Rebel 500 is leaving you in the dust, there must be something significantly wrong with your setup. As you say you have clean plugs, have verified timing, I would start with checks of throttle displacement ( are you getting full lift at the slides?), air inlet restrictions, compression, .... must be something way off. A rephased 750 on VM 34's should fly. Keep us posted!I've been looking for such baselines but haven't come across any in my searches. Where can I find these, or what is the baseline? Additionally, are there timing modifications needed or is the stock 38 degrees still pretty much right?
Reason for the query is that my 750 big bore, 270 rephased motor is pretty gutless. I'm running 210 mains, upped from 190's. Plugs look perfect colour and timing seems close to stock at around 18ish idle, 38ish at 3500rpm. But the wife's 500 Rebel can leave me behind on top end, as my motor struggles to haul me up to 75mph!!!
210 mains in VM 34's seems big.I've been looking for such baselines but haven't come across any in my searches. Where can I find these, or what is the baseline? Additionally, are there timing modifications needed or is the stock 38 degrees still pretty much right?
Reason for the query is that my 750 big bore, 270 rephased motor is pretty gutless. I'm running 210 mains, upped from 190's. Plugs look perfect colour and timing seems close to stock at around 18ish idle, 38ish at 3500rpm. But the wife's 500 Rebel can leave me behind on top end, as my motor struggles to haul me up to 75mph!!!
I suspect Grizld meant Keihin FCR flatslide pumpers. Those are indeed great carbs, I have a set of FCR 39 on my Ducati M600 with a 680 kit, and they work great. Better throttle response, better fuel mileage, and way better low rpm running than the OEM Mikuni 38 mm flatslide CV carbs.VM34 is a good choice on a limited budget. The best IMO would be Keihin CRF's--very serious money, and you'd be in very new territory, no user data for the XS650/750. Close in quality are the Mikuni 34 mm. dedicated 4-stroke pumper kits sold by Topham Mikuni in Germany; go to www.mikunitopham.de
Mikunioz!thanks guys i got the answers i was looking for now i got to find the best place to buy them any ideas thanks andrew from down under