1968 XLR??

[ambike]

Who's the seller ?

Contact info is ______ ?

[EKHKHK56]

The XLR engine is full ball bearing. Crank and cams except #2 outboard is still large bushing. #9002R covers the inboard and #9028R outboard. The oil pump is 1/4 crank speed and pressure relief is set at 5 psi. I noticed specs on rear fork bearing load which came up as an earlier topic. As I figured it is the "standard" Timken bearing type preload of 1 lb but up to 2. On constant revolving bearings like automotive wheel bearings you never go over 1 lb or they will burn up. Adding 1 more pound to the slightly moving rear fork bearings won't hurt at all. Erik K

[Zaemo]

Who's the seller ?

Contact info is ______ ?

I'm going to assume you were or are ________

A) A teacher

B) Trying to ask politely for the information

C) None of the above

[thefrenchowl]

Erik: As I figured it is the "standard" Timken bearing type preload of 1 lb but up to 2

The race manuals actually say ""adjust between 1 and 2 lbs pre load"".

Zeamo, you only took one photo of it?

To those who think $12,000.00 is too much for a real race engine, just go and try to buy a race Vincent or Norton Manx engine...

I paid $7,500.00 for my 1966 XLRTT Hill Climber in 1996 when nobody would touch them (it had been for 6 months in the Walneck Ads magazine before I bought it...)

Read all about the chase here:

http://www.harleykrxlrtt.com/find%20a%20racer.htm

As it was then:



About the same time I also forked out GB£6,500.00 for my 750KK, that was actually way dearer than the XLRTT...

Dr Dick much later schooled me on the cylinders, very early and rare Dytch sleepers as he call them...

So long, Patrick

[sportsterpaul]

Here is a long shot of the same engine, wide view I posted in the swap meet thread.

AMCA-Sunshine-2017_XR-engine.jpg (97.57 KiB) Viewed 11264 times

I look forward to the all arguments about how many screws in the primary, we already have one guys saying 9 and another saying 10.

The 1/4 drive oil pump makes sense in a racer that runs at high speed all the time. There is way too much oil in the bottom end most times, the the flywheels whipping up all that oil casts several HP and also heat the oil up. I know a few racers that would put a restrictor in the flywheel pinion shaft to reduce oil into the crankcase, as well as weld on a sump to keep the oil away from the spinning wheels. Duncan Keller took Patrick's advice to heart and designed an auxiliary scavenge pump that drives off the #2 camshaft of a cone motor (a race engine has a mag anyway). He set up one of Vance Breese's bikes this way, and everyone said the motor would burn up without an oil cooler, but it ran fine for many races, and as cool or cooler than the other Sportsters. Oh, he had scrapers on the flywheels as well.

Another aspect of driving the oil pump slower is that is would save power that would then appear at the crank. Hard to say how much, but even one or two HP might matter.

[mikeslemmon]

10 screw bosses but the latest ones only had 9 .screws in the cover I think

[Maxcapacity]

I look forward to the all arguments about how many screws in the primary, we already have one guys saying 9 and another saying 10.

As the guy who said 10, I'm not here to argue. Sorry to spoil your fun.

I agree with this:

10 screw bosses but the latest ones only had 9 .screws in the cover I think

[gabbyjon]

I just recently took a set of heads for a repair to a local shop and the owner called me exited to tell me the heads were XLR heads.Said he had been looking for a set for many years and would give his left nut,said he wasnt using it anyway haha They are being used on a 66 I built with different year parts updated with such parts as newer disc brake front end and Morris mag wheels the motor also came with balanced strocker wheels nothing to big.Has a turtle tank and late model xl handle bars. painted orange red with a white stripe down the center.Looks good.I purchased the motor for wapping $100.00 and had a total rebuild done by a very expert motor builder.When I brought the motor to him he recognized it and said he had modified it many years ago.The owner brought it to him with the request that he make it into an electric start.His response was do you realize the work and money it would take.The owner says do it.I now have a 66 xlch with a later model left case mated to the early right case making it an electric start with distributor for spark and wet clutch.thought you guys might find this interesting.Talk about lucky! the repair was for a broken valve at the keepers, the valve for some reason did not fall into the cylinder which as you all know would have been a disaster.Would have made a mess of those precious heads.

[ambike]

Was I supposed to adjust muh pussy hat before asking about that XLR motor missing its spark ?

Class dismissed !

[thefrenchowl]

It's not that hard to follow if you can process information...

OEM 52 > 69 KR and XLR: 10 bosses and 10 screws.

A few late 60s KR and XLR with XLCH 9 screws tin covers: 10 bosses, 9 screws

70 and after XR and XLR; 9 bosses, 9 screws...

Patrick