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What year would a 70 hp Yamaha , 70 BIIO 6H3 L 481757. Thanks,

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1974 Yamaha dt360

My friend Dan and I have been working on vintage Yamaha's for over 10 years now. We know a good bit about different dt model's. We are not certified mechanics, so everything we know is from years of experience, and older generation riders experiences. My tip is about the Oil Pump that injects two stroke oil when you give it throttle. Last year i bought a near mint condition, 1974 Yamaha dt360. When overhauling the bike, my long time friend and riding partner Dan who owns about 5 different yamaha's, models from the late 60's the late 70's, suggested we disconnect the oil pump (clutch side) and drain all the oil out and pre mix the gas. Reasoning for this is he has heard numerous stories over the years about the pumps either seizing, or when you lay the bike over air bubbles can form which will then increase chances of the system not functioning properly causing the motor to seize. I kept mine installed on the bike, but disconnected the hose on the inside of the cover and drained all the old oil out, now I pre mix the gas. Thanks for reading.

on Feb 26, 2015 | Motorcycles

1 Answer

Serial no. 469271 70 h.p. yamaha outboard motor what year is it?

It is not possible to retriev a year on yamaha with only the serial number.
On the serial number sticker, you'll find other data, like type, length, horsepower, weight etc...
In the link I give you'll find all the needed data and you will be able to obtain a mfg year...
Posts Tagged Yamaha Outboard Serial Numbers

Oct 06, 2017 | Yamaha Boating

1 Answer

Yamaha psr 70

YAMAHA PSR-70 Keyboard - Lights On - No Sound
This may be the cause if the unit has not been powered up for a while; switched LEDs come on but fails to produce any sound from either or both channels:
Normally one would suspect faulty headphone switch jack or faulty LA4500 power output chips.

Most electrolytic capacitors can be slightly leaky (tens or hundreds ofkilo-ohms) after years of non-use.. They are re-polarized / reformed when equipment is switched on after aperiod of non-use and this effect would probably not be noticed since it make only takeseconds for all electrolytic capacitors to come up to specification...
In the circuit used for the Yamaha PSR-70(see the Sanyo Applications Notes for the LA4500)there is an 'anti-thump' / slow start capacitor (220uf 16V, aluminium electrolytic 'ripple filter' capacitor) connected between pin 9 and ground (of both LA4500 audio output chips in the PSR-70).Since these hold the chip in a power down condition, they cannot 'reform'from a near rail voltage normally present when the chip is turned on, due to lack of power and thus continually hold the amplifiers in a quiescent power down mode..
To remedy, they need to be disconnected and reformed with a 9Volt battery.After the Chips have powered up, there should then be about 90% of the rail voltage on their PIN 9...

They are not necessarily faulty, they just needs for the equipment to be powered up working for a minute (every year or so).Alternatively a4700 ohm(2m/A) resistor temporarily wired from the (9V) + rail(PIN 1) to PIN 9 of the LA 4500 may do the trick..
This reported fault may be very unusual or fairly common (these keyboards now being almost 30 years old...)

Hope this helps someone out - feedback will be appreciated

September 2014

Apr 23, 2014 | Computers & Internet

1 Answer

How to change a thermostst on a 70 hp yamaha engine

yamaha has changed up designs but most are under the water jacket resevoir. This will be a rectangle looking box cover with several bolts on the side.

Mar 22, 2012 | Sierra International 18-0829 Marine Cover...

1 Answer

Hi! ALL How do I connect my Yamaha eq-70 to pre amp and power amp my Yamaha thanks

Pre-amp out to input of EQ

Output of EQ to poweramp.

If that doesn't help post all your model numbers and I will look it up.


Jan 06, 2010 | Yamaha EQ-70 Home Equalizer

2 Answers

How to hook up my Yamaha EQ-70 Equalizer


This is official image from Yamaha. If need to know more, go to the below address -

download the amp's manual & you will find on page no. 7

Jul 05, 2009 | Yamaha EQ-70 Home Equalizer

2 Answers

Yamaha display bulb

I'll have to see a manual but I think its around 6 volts.

Mar 10, 2009 | Yamaha EQ-70 Home Equalizer

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