SOHC.co.uk Forums > CB750
Some Minor Issues to Sort
Martin6:
Could be.
Rear is new. Avon RR. I rebuilt that wheel, but checked it again today and all seems true.
Front is about 100 miles old, but has been on 4 years, i could have a flatspot from standing.
paul G:
Aren't the dots normally the heavy point on the tyre and usually 180 deg from the valve ?
K2-K6:
--- Quote from: Martin6 on April 11, 2023, 05:25:46 PM --- Standing, front brake on and pumping the bars, it moves up and down and seems damped, but is stiff. Will check which fork oil it has in there. What grade is recommended for a compliant ride?
- May be related; the clutch bite seems quite late in the lever outwards movement, but no clutch slip is evident when i open the throttle. Is this usual?
👍
--- End quote ---
Fork oil, many go too heavy with this in my experience, partly promoting some level of hydraulic "locking" in response to pattering Road surface. Effectively tge fork doesn't want to move at the linear rate the road irregularities are kicking the suspension up at and causing a little "bucking" feel to come through the front end.
Reality check though, is to assess current level of existing oil, too high will give less fork response than design intention.
Try using Motul 2.5 grade viscosity fork oil at correct level /quantity to see if it's effective in getting the response you want. It's a very good oil anyway and won't give problem, but some may prefer 5 viscosity.
Healthy clutch engagement is ok fairly far out as it makes sure the clutch fully disengages and promotes no clunk when going to first gear when stationery.
If the clutch is used hard on these, heating up the clutch pack moves the lift mech thrust away from the operating mech, and you'll feel the bite point move in toward the bars in this case. You do have to get them pretty hot to see that, but it doesn't usually make it slip with this arrangement.
Martin6:
--- Quote from: paul G on April 12, 2023, 07:41:18 AM ---Aren't the dots normally the heavy point on the tyre and usually 180 deg from the valve ?
--- End quote ---
Yellow dots, if you have them, are the lightest point on the tyre. To be mounted where the valve is. Red dots signify the flattest point of the tyre. I don't know why, but I always mount them where the valve is, perhaps on the assumption 'flat' = lighter. The odd thing is my front also had a 20g weight at the valve area.
Martin6:
--- Quote from: K2-K6 on April 12, 2023, 08:35:15 AM ---
--- Quote from: Martin6 on April 11, 2023, 05:25:46 PM --- Standing, front brake on and pumping the bars, it moves up and down and seems damped, but is stiff. Will check which fork oil it has in there. What grade is recommended for a compliant ride?
- May be related; the clutch bite seems quite late in the lever outwards movement, but no clutch slip is evident when i open the throttle. Is this usual?
👍
--- End quote ---
Fork oil, many go too heavy with this in my experience, partly promoting some level of hydraulic "locking" in response to pattering Road surface. Effectively tge fork doesn't want to move at the linear rate the road irregularities are kicking the suspension up at and causing a little "bucking" feel to come through the front end.
Reality check though, is to assess current level of existing oil, too high will give less fork response than design intention.
Try using Motul 2.5 grade viscosity fork oil at correct level /quantity to see if it's effective in getting the response you want. It's a very good oil anyway and won't give problem, but some may prefer 5 viscosity.
Healthy clutch engagement is ok fairly far out as it makes sure the clutch fully disengages and promotes no clunk when going to first gear when stationery.
If the clutch is used hard on these, heating up the clutch pack moves the lift mech thrust away from the operating mech, and you'll feel the bite point move in toward the bars in this case. You do have to get them pretty hot to see that, but it doesn't usually make it slip with this arrangement.
--- End quote ---
👍
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version