Ly7 engine tuning

[Donny D]

Don't go by the trip computer as they tend not to be accurate. Mine says 17lph most of the time around here yet when I properly measured it it was closer to 15lph. If I use the loud pedal then I get around 16lph.

My obd2 has mileage monitoring and it is usually 0.1 to 0.2 difference between the trip computer but you have to reset for the road and inclination or decline

 

[losh1971]

The proper way to test economy is to fill the tank to the top of the filler neck and drive it for 100km or 200km. Then fill it to the top of the neck again. Do that a couple of times and you will get an accurate reading.

 

[losh1971]

I've had a few different cars with trip comps and none have ever been accurate.

 

[uglyoldfatbastard]

What bikes are those? Most Jap bikes run on the sniff of an oily rag. If you're referring to Harley's as you mentioned earlier IIRC then they tend to guzzle fuel for some reason. My RD400 uses about 300-350mls every min.

Sorry I am referencing Harleys although many older Jap bikes are gas guzzlers.
Just look at the first early Honda Superbikes the 750/4 with 4 carbs it used more fuel than my HD Holden.

 

[losh1971]

Hahahaha 750 Honda, superbike. Never heard them call that. Blokes who race them spend over $30k upgrading them and are still beat by 750 triples with only $3k spent on them. Mate had a 750 four, and my RD with a few basic mods would blow it away.

 

[uglyoldfatbastard]

Hahahaha 750 Honda, superbike. Never heard them call that. Blokes who race them spend over $30k upgrading them and are still beat by 750 triples with only $3k spent on them. Mate had a 750 four, and my RD with a few basic mods would blow it away.

Well they were considered in 1970 to be one of the first superbikes not something that rings true in 2023 but in 1970 it was another story.

The 750 Four debuts​

In 1967, rumors began to circulate that Honda was building a 750. Many people thought it would be a twin, like the popular British motorcycles of the time, but when a prototype was exhibited at the Tokyo Motor Show in October 1968, the powerplant turned out to be an inline 4-cylinder. Observers thought the bike owed a lot to Honda’s 500cc GP race bike. Like the racer, the new four had its cylinders transverse to the frame. But where the racer had double overhead camshafts, the street four had a single overhead cam. Painted Candy Blue Green, the new model stirred up international interest and would-be customers jammed Honda dealers’ phone lines, only to be told they didn’t have any 750s and didn’t know when they would. An unknown journalist dubbed the new machine a Superbike — the first recorded use of the term.

So if you have never heard them called superbikes I would imagine you were not riding in 1970
Whereas I had L plates on a 750/4 hahahahaha
So where were you in 1970?

1970 Honda CB750 K0
Engine: 736cc air-cooled SOHC inline 4-cylinder, 61mm x 63mm bore and stroke, 9:1 compression ratio, 67hp @ 8,000rpm (claimed)
Top speed: 123mph (period test)
Carburetion: Four 28mm Keihin
Transmission: 5-speed, chain final drive
Electrics: 12v, coil and breaker points ignition
Frame/wheelbase: Dual downtube steel cradle/57.3in (1,455.5mm)
Suspension: Telescopic forks front, twin shocks w/adjustable preload rear
Brakes: Single 10in (254mm) disc front, 7.1in (178mm) SLS drum rear
Tires: 3.25 x 19in front, 4 x 18in rear
Weight: 499lb (w/half tank fuel)
Seat height: 31.5in (800mm)
Fuel capacity/MPG: 4.8gal (18.1ltr)/35-40mpg

 

[losh1971]

Like I said my bike used to blow away a mates stock 750 Honda. They can be made to go hard but like I also said it was $30k to build them fast and that was nearly 20 years ago.

 

[uglyoldfatbastard]

Like I said my bike used to blow away a mates stock 750 Honda. They can be made to go hard but like I also said it was $30k to build them fast and that was nearly 20 years ago.

Well you said you had never heard the term superbike referring to a 750/4
Whereas the actual phrase was first coined for a 750/4
Little bit of history that you never knew and thought was quite funny but was actually true.

 

[losh1971]

Not sure if you have heard of Steve Dent? But he raced the top rider in the Australian titles around 30 years ago. The bloke had a $35k stroked Honda. Steve beat him on a $5k 750 Triple. They may have been called Superbikes but even at the time they were hardly fast compared to other bikes of the same era.

 

[Donny D]

Not sure if you have heard of Steve Dent? But he raced the top rider in the Australian titles around 30 years ago. The bloke had a $35k stroked Honda. Steve beat him on a $5k 750 Triple. They may have been called Superbikes but even at the time they were hardly fast compared to other bikes of the same era.

Good way to hijack a post