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Daves Other V-twin +Turbo (Drift Quad)


Muncie

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I snaffled this off Trademe after watching it for ages it needs a cam which is no major so I'll order one off ebay and see how it runs.

Been later model then my GX610 on the scooter it has CDI ignition  bigger charge coil and is 688cc.

Dont know what ill do with it........

 

Specs as below :

Honda GX690RHTXF7 Horizontal Shaft V-Twin Engine

Features

GX690 with 1 1/8 Inch crankshaft

TYPE Air cooled 4-stroke OHV petrol engine, 90° V-twin design, horizontal shaft

BORE & STROKE2 / 78 x 72 mm

DISPLACEMENT 688 cm3

COMPRESSION RATIO9.3:1

NET POWER 16.5 kW (22.1 HP) / 3 600 rpm

CONTINUOUS RATED POWER11.5 kW (15.4 HP) / 3 000 rpm 13.0 kW (17.4 HP) / 3 600 rpm

MAXIMUM NET TORQUE 48.3 Nm / 4.93 kgfm / 2 500 rpm

IGNITION SYSTEM Digital CDI with variable ignition timing

STARTING SYSTEM Electric starter

FUEL CONSUMPTION AT RATED POWER 6.7 L/hr - 3 600 rpm

LUBRICATION SYSTEM Full-pressure

OIL CAPACITY 1.9ltr

DIMENSIONS 429 x 410 x 438 mm (T-Type)

DRY WEIGHT 44.6kg

Screenshot_20191121-134607_Trade Me.jpg

Screenshot_20191121-134625_Trade Me.jpg

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Think this might end up with the Mikuni's on it.... i have a mountain of cool stuff ive stock piled for the other engine but have sidestepped for whatever reason. Could repower a Prius maybe. A cross kart is the dream machine and i have an uncle who races a polaris with spares i could potentially burgle.

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I've got it back from Auckland today from a Stihl shop mechanic who was quite switched on and had an equally cool engine project. Everything thing is there quite frankly i could make it run on the existing cam. Its the governor that failed (like it'll need that!!) The fibre gear on the cam is a bit worn but would work fine.

Hmmm stand by im going to degrease it and make sure its complete.

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I knew this when i bought it this runs a 1 1/8 crank so clutches drives etc are either bloody moonbeams or industrial spec and wont take more than 3000rpm. 

1" is the standard off the shelf  size i can either machine down the crank so im back in to 1" parts. I would like gearbox though..... any ideas?

Rumour has it these punch out 25-28 hp peak so i may even have to run 2 centrifugal clutches to get the power out.

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Im thinking hard about some sort of belt drive as a chain spinning constantly would chatter quite a lot. A Jack shaft would be the easiest fix. 

Its good having a look inside one of these engines as ive not cracked the other open yet probably should as the governor is still in there and has seen 2000rpm over what it trys to control..... might explain why it sounds like it has gilmer drives.

Going to bang the cam in tomorrow fresh oil and see what it does.

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Chook woke me up at 5.50 this morning..... so just waiting for repco to open so i can get some Rtv will get side cover on put oil in it should run!

Gutted the governor completely it came with a new one, to me it seems like a failure point so see ya later fun police device.

This engine is drastically different to my other engine lots of plastic covers but its very cleverly assembled, the rockers are held in by a pin that is held in by nothing but gravity no tools came out till i was ready to put crankcase cover on, except for the hammer i used to punch the governor out.

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Minor fail ive assembled it on my trestle instead of the floor and now its too heavy to lift down.... forget how heavy these things are with all the shit on them i took it all off on the other engine.

Will start stripping unnecessary shit off to make lighter and more compact.

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