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Messages - patentgeek

Pages: [1] 2 3 ... 6
1
Engine and Transmission / Re: Oil Pressure Relief Valve
« on: August 28, 2019, 07:24:36 pm »
Regarding drilling a small hole on the base of the pressure relief valve such that oil always flows to the cam, even when the valve isn't open.

I've seen (2) different styles of pressure relief valve (pics at the link below). The one with wrench flats at the base has space for the jet. The one with wrench flats at the top does not.

https://1drv.ms/u/s!AuFSdkt2JFpfhsp_hZ8kYWbifnF6cg?e=GaMcVZ

Both of my pressure relief valves lack the space for the jet :(

2
Engine and Transmission / Re: Oil Pressure Relief Valve
« on: August 19, 2019, 06:19:38 pm »
I've been thinking more about pros/cons of replacing the pressure relief valve with an "always flowing" oil manifold.  It might be possible to do this with a double or triple banjo bolt.  Carb jets could be fitted to the output of the banjo fittings to control aperture diameter and flow - - - similar to what is done for the intake rocker arm oil modification.

The potential risk is too much oil flow through the oil manifold, resulting in insufficient oil flow to the crank and top end.  My NF has a Daytona twin oil pump and the clutch cover crank oil seal modification, so I probably have less risk than someone with a stock setup.  I suspect I could run some experiments with a pressure gauge installed in place of the oil pressure sensor to quantify this risk.

3
Engine and Transmission / Re: Oil Pressure Relief Valve
« on: August 19, 2019, 01:21:54 am »
I found some pics on the German NF and Adventurerider sites.

One modification is to drill a small hole on the base of the pressure relief valve such that oil always flows to the cam, even when the valve isn't open.

Another modification is to completely replace the pressure relief valve with a similarly sized piece of aluminum with three small holes that acts as a manifold to feed oil to the two cam lobes and the primary gears.

Another thing that came up in my research is whether the pressure relief valve should have a "cup" around the valve.  I couldn't find the cup in the parts manual.  The valve in my bike lacks the cup, but I have a spare valve from an older engine that has the cup.  Any thoughts as to whether the cup is critical?




4
Engine and Transmission / Re: Oil Pressure Relief Valve
« on: August 15, 2019, 12:33:12 am »
Quote
There's a mod, common in Europe, to add an oil feed spray to the camshaft, so it's always lubricated. Alternatively, give it a good thrashing.

Does anyone have details on this modification?  For example, pics or specifications?

5
Engine and Transmission / Re: Valve springs
« on: August 08, 2019, 07:15:45 am »
I'm looking for specs on the "better solutions".  Those are available from suppliers in Europe, but if I had the specs, I could just order from Kibblewight in the U.S.

6
Engine and Transmission / Oil Pressure Relief Valve
« on: August 07, 2019, 12:27:52 am »
The oil pressure relief valve on our NF's seems like an odd design.  The primary function of the valve is to prioritize oil supply to the crank and top end over the cam in the event oil pressure drops - - - maybe because it's a lot easier to replace a cam than a crank?

The position of the oil pressure switch upstream of the valve  (i.e., positive side) is also problematic.  The switch could indicate oil pressure is okay when the pressure relief valve is stuck resulting in cam oil starvation.

Has anyone replaced their oil pressure relief valve with a fixed orifice/jet?

7
Engine and Transmission / Re: Valve springs
« on: August 06, 2019, 11:15:21 pm »
Has anyone figured out specifications for the more conventionally sized valves and guides so they can ordered from Kibblewight, Mahle or some other manufacturer?

8
Electrics / Re: LED Tailight
« on: June 28, 2019, 06:53:10 pm »
I ordered one and will update this thread with the manufacturer's info when I receive it.  That might allow the UK/Euro folks to find a local supplier.

9
Electrics / LED Tailight
« on: June 28, 2019, 05:48:10 pm »
This appears to be a plug and play LED tailight for the NF:

https://www.superbrightleds.com/moreinfo/trailer-tail-brake-turn/round-led-trailer-light-w-license-plate-light-4-led-braketurntail-light-w-9-high-flux-leds-pigtail-connector/1111/2629/

Mounting stud center to center distance is ~50mm so the same as the CEV lamp.  Lens diameter is slightly larger.

10
Engine and Transmission / Re: Clutch Plate and Spring Dimensions
« on: June 28, 2019, 05:42:11 pm »
Redsingle/Leo has a new clutch assembly and kindly measured plate thickness as 2.6mm.

He also suggested that oftentimes clutch slippage isn't due to wear, but to contamination (e.g.., sludge, etc.).

So in summary:

*spring free length: 37.4 - 37.5mm
*spring compression under load: 27mm under 16kg (+/- 3%)
*clutch plate thickness: 2.6mm


11
Engine and Transmission / Re: Clutch Plate and Spring Dimensions
« on: June 26, 2019, 08:59:46 pm »
Thanks!  Missed the spring dimensions in the manual.

Yes, badly worn clutch plates should be obvious.  But if mine aren't badly worn, I was hoping to get an idea as to how much life is left.

I have a new set of clutch springs in my spares, so if the originals are < 37.4mm, I'll replace and see what happens.

12
Engine and Transmission / Clutch Plate and Spring Dimensions
« on: June 25, 2019, 09:08:05 pm »
Does anyone have in-spec vs. out-of-spec dimensions for the clutch plates and clutch springs?

My clutch seems to be slipping a bit, especially on really hot days.  I'd like to measure the plates and springs to confirm wear before ordering new parts.  I'm running wet-clutch compatible engine oil. 


13
Electrics / Re: Sachse Electronic Ignition
« on: June 25, 2019, 08:41:14 pm »
I finally got around to installing the Sachse electronic ignition I bought for my NF more than a year ago.  I've put >1000 miles on the bike since, and it's running quite well - - - better than it was with my somewhat sloppy advance mechanism.  Installation was very simple, and checking static timing is very easy as the Sachse pickup plate has a built-in LED that turns off when the piston reaches TDC.  I bought the lower cost unit that only has 3 advance curves.  The more expensive unit with additional advance curves and a rev limiter might be more interesting to the hot rod guys.

I'll keep the mechanical advance on the bike as a backup as I've set up the wiring so I can convert back to stock in about 20 minutes.

Given the high cost and limited availability of stock advance mechanism, the Sachse system seems like a reasonable alternative.

14
Electrics / Re: Points Gap Adjustment Screw Size?
« on: June 11, 2019, 09:49:55 pm »
Quote
hello i have a motor on the workbench i just watch the screws do M4x0,9 but the original screws are shorter

The question isn't directed to the length but rather pitch.

I double checked my factory parts manual and couldn't find the points gap adjusting screw listed anywhere.

15
Electrics / Re: Points Gap Adjustment Screw Size?
« on: June 11, 2019, 12:28:11 am »
Ha!  I've run into the same seat-belt bolt issue in a late 80's Honda automobile.

Rear passenger pegs on some vintage Euro motorcycles are the same - - - the entire bike is metric except for the passenger peg mounts.  Very weird.

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