Krauser heads

lewisjohn

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I’ve just spotted a set of Krauser 4 valve heads and pistons for sale on eBay.

£5400.00.😱😱😱

I think I’d spend that sort of money on a couple of airheads.
 
There were a couple of krauser bikes at the Airhead weekend,
I was talking to Steve Scriminger,and Bob porecha about them,neither had much positive to say about them.
Value through rarity



Tho,I’ll admit to knowing very little about them.
I don’t build race bikes or engines,
Only the odd hotish (warm) motor.
If you want a fast bike,buy a fast bike:thumby:
 
There were a couple of krauser bikes at the Airhead weekend,
I was talking to Steve Scriminger,and Bob porecha about them,neither had much positive to say about them.
Value through rarity


Tho,I’ll admit to knowing very little about them.
I don’t build race bikes or engines,
Only the odd hotish (warm) motor.
If you want a fast bike,buy a fast bike:thumby:

I don’t want to go fast, that’s why ive got Airheads and a Harley.��
 
I'd guess that one cam drives one rod which in turn now pushes against two valves instead of the regular one, probably opens up a whole new world of worn cams and followers.
 
Crap, noisy and rattly as feck and need adjusting every 500 miles (if you're lucky).
 
Someone on AdvRider used a pair on a project bike a few years bike. Same conclusion though; very rattly, needed constant adjustment and no improvement in performance.
 
There is a community of owners of these thing, and apparently the early problems have been sorted out and most who have them are now quite happy with them.
But it probably takes a bit of specialist knowledge and expertise to get them working properly, so no surprise they get a caning from some who might be a little short of either, or both!
 
I was talking to Steve Scriminger,and Bob porecha about them,neither had much positive to say about them.

But it probably takes a bit of specialist knowledge and expertise to get them working properly, so no surprise they get a caning from some who might be a little short of either, or both!

:D:D Hilarious.
 
There were a couple of krauser bikes at the Airhead weekend,
I was talking to Steve Scriminger,and Bob porecha about them,neither had much positive to say about them.
Value through rarity



Tho,I’ll admit to knowing very little about them.
I don’t build race bikes or engines,
Only the odd hotish (warm) motor.
If you want a fast bike,buy a fast bike:thumby:

I would love a Krauser framed bike, but it might just ruin my back. Some of the airhead tuners reckon that they can get very similar results from a fettled engine without the complexity of 4 valves.


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My four valve F650 Funduro has a 230 degree cam and in soft tune makes 48 BHP with a muffler.
It takes 336 degrees to get a two valve airhead anywhere near that specific output.
When you understand why it is able to do so you might, just might, understand why some might have the opinion they do.
And why the majority of engines designed in the last 40 years have four valve motors
Until then, keep laughing!
 
But a Funduro also has OHC, FI and proper electronics which enables it to run a high CR......

Nothing wrong with 4 valves per Se, (I also have a 1937 Rudge), but the Krauser version seems to me to have been a piece of underdeveloped aftermarket Bling.


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I first rode an airhead in 1979 and BMW mechanics said, even then, that two parts you should avoid for airheads...Lester wheels and Krauser heads !

Lester wheels and the monthly wheel bearing change. :D

My four valve F650 Funduro has a 230 degree cam and in soft tune makes 48 BHP with a muffler.
It takes 336 degrees to get a two valve airhead anywhere near that specific output.
When you understand why it is able to do so you might, just might, understand why some might have the opinion they do.
And why the majority of engines designed in the last 40 years have four valve motors
Until then, keep laughing!

I'll keep on laughing because i've ridden them and worked on them.

You carry on reading about them. :D
 
Steptoe, I have built a race bike with them too - 87 HP and no rattling!
But you have to know what you are doing, which you obviously dont.
FWIW they were always intended for race use, fitting them to a road bike is an exercise in futility, as you have so eloquently and inadvertently pointed out !
My Funduro has carbs and the same CR as the Krauser equipped bikes, the kit comes with the correct pistons.
 


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