Woody
Woody GRM+ Memberand MegaDork
9/29/19 8:51 a.m.

Some of you might remember the scooter. I picked it up as a non-runner, fiddled with it on and off through the summer until I eventually got it to the point where it still wouldn't run.

 

I do believe that it will run again, but I also believed that I wasn't going to be the guy to get it there. I had simply lost interest, and pushed it into a heavily trafficed corner of the garage, where I found it to be in my way almost every day for a couple of months.

Yesterday morning, I decided to try my luck with Facebook Marketplace for the first time. I advertised it as "complete, but will not start". Minutes later, my phone started pinging like crazy. The first response sounded a little Craigslist Scammy, but the next guy asked if I would be interested in trading it for a Honda generator plus some cash. I already have a generator, but it sounded interesting enough to consider. I asked if it was actually a Honda generator, or just a generator with a Honda engine. He confirmed that it was actually a Honda and sent a video of it running. I was intrigued, so we set up a time for early afternoon.

My phone continued to ping all morning with various offers, in three languages and at least two alphabets, many of which seemed legit. Most were lowball cash offers that I probably would have taken anyway. One guy from the next town over offered a running two stroke Honda scooter, but I had already decided that I was done with scooters, at least for a while.

He showed up, nice guy, looked at the scooter and confirmed that it wouldn't start. I looked at the generator and confirmed that it would. We haggled a little and made a deal.

I now own a Honda EB 4000, of undetermined horsepower.

It does run, but really needs a new carb, as the entire choke assembly is missing. He started it using a squirt of fuel from a spray bottle and two pulls of the rope. It fired right up and ran smoothly on two year old gas.

Again, I don't really need another generator, but we lose power around here all the time. I look forward to cleaning it up, swapping in a new carb, and then selling it or trading it for something else that don't really need.

 

Woody
Woody GRM+ Memberand MegaDork
9/29/19 8:53 a.m.

^This thing is Berkeleying heavy.

Woody
Woody GRM+ Memberand MegaDork
9/29/19 9:07 a.m.

Woody
Woody GRM+ Memberand MegaDork
9/29/19 9:13 a.m.

This is probably a version of the Honda G400 engine.

 

https://www.engine-specs.net/honda/g400.html

 

Honda G400

 

Honda G400 engineThe Honda G400 is a 406 cc (24.8 cu.in.) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1978 for general-purpose applications.

The Honda G400 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. The engine has an electric or recoil starter, horizontal carburetor with butterfly valve and transistorized magneto or contact point breaker (CDI) ignition system.

 

Cylinder bore and piston stroke are 86.0 mm (3.4 in) and 70.0 mm (2.8 in), respectively. Compression ratio is 6.5:1 for G400 and 6.8:1 for G400K1. The G400 produced 10.0 HP (7.45 kW) at 3600 rpm of maximum horsepower and torque was 22.5 Nm (2.3 kg·m) at 3600 rpm. The dry weight of the Honda G400 with electric starter engine was 33 kg (72.7 lbs.).

General information

Engine Specifications
Model G400
Type 4-stroke, side valve type (L-head), single cylinder
Displacement 406 cm 3 (24.8 cu-in)
Max. horsepower 10.0 HP (7.45 kW) at 3600 rpm
Max. torque 22.5 Nm (2.3 kg·m) at 3600 rpm
Carburetor Horizontal, butterfly valve
Cooling system Forced-air
Ignition system Transistorized magneto or CDI
Lubricating system Splash system
Starting system Recoil or electric starter
Stoping system Ground switch
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 6.0 L
Fuel consumption 270 g/HPh
PTO shaft rotation Counterclockwise (from PTO shaft side)
 

Cylinder Block and Head

Cylinder block
Compression ratio: G400 – 6.5:1
G400K1 – 6.8:1
Bore x Stroke 86 X 70 mm (3.4 x 2.8 in)
Sleeve internal diameter 86.00-86.02 mm (3.3858-3.3866 in)
Piston skirt outer diameter 85.97-86.00 mm (3.385-3.386 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top 0.02-0.06 mm (0.0008-0.0024 in)
Second/oil 0.01-0.05 mm (0.0004-0.0020 in)
Ring end gap Top/second 0.2-0.4 mm (0.008-0.016 in)
Oil 0.2-0.4 mm (0.008-0.016 in)
Ring width Top/second 1.97-1.99 mm (0.0776-0.783 in)
Oil 3.97-3.99 mm (0.1563-0.1571 in)
Connecting rod small end ID 19.005-19.020 mm (0.7482-07488 in)
Crankshaft crankpin outer diameter 36.943-36.959 mm (1.4544-1.1551 in)
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: Side valve type
Valves: 2
Stem outer diameter (standard): INTAKE 6.955-6.970 mm (0.2738-0.2744 in)
EXHAUST 6.910-6.925 mm (0.2720-0.2726 in)
Guide internal diameter INTAKE / EXHAUST 7.00-7.015 mm (0.2756-0.2762 in)
Spring free length 42.7 mm (1.6811 in)
Cam height: INTAKE 38.46-38.72 mm (1.5142-1.5244 in)
EXHAUST 38.49-38.75 mm (1.5154-1.5256 in)
 

Maintenance data

Engine
Idle speed 1400 ± 150 rpm
Cylinder compression 5.3 kg/cm2 (75 psi)
Adjust timing ignition
Ignition timing 20° B.T.D.C. – for magneto ignition
The CDI type does not require adjustment.
Adjust valve clearance
Intake valve 0.05-0.11 ± 0.02 (0.0020-0.0043 in)
Exhaust valve 0.09-0.15 ± 0.02 (0.0035-0.0059 in)
Oil system
Oil type Honda 4-stroke “SE”
Recommended oil 10W-40
Oil capacity 1.2 L (2.54 US pt.)
Carburetor
Main jet #102
Float height 8.6 mm (0.34 in)
Ignition system
Spark plug NGK: B4H, BR4HS for magneto ignition
NGK: BP4HS-10, BPR4HS-10 for CDI ignition
Spark plug gap 0.6-0.7 mm (0.024-0.028 in), for magneto ignition
0.9-0.10 mm (0.035-0.039 in), for CDI ignition
 

Tightening torque specs

Tightening torque specs
Fuel valve (12 mm) 12-15 Nm; 1.2-1.5 kg·m; 8.7-10.8 ft·lb
Flywheel (16 mm) 110-120 Nm; 11.0-12.0 kg·m; 80-87 ft·lb
Cylinder head Serial № before 129741: 43-47 Nm; 4.3-4.7 kg·m; 31-34 ft·lb
Serial № after 129742: 32-38 Nm; 3.2-3.8 kg·m; 23-27 ft·lb
Tappet cover (6 mm) 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Crankcase cover (8 mm) 20-24 Nm; 2.0-2.4 kg·m; 15-17 ft·lb
Connecting rod Serial № before 1085859: 21.6-26.4 Nm; 2.16-2.64 kg·m; 16-19 ft·lb
Serial № after 1085860: 24-28 Nm; 2.4-2.8 kg·m; 17-20 ft·lb
Fuel tank (8 mm) 20-28 Nm; 2.0-2.8 kg·m; 15-20 ft·lb
Oil drain plug 15-25 Nm; 1.5-2.5 kg·m; 11-18 ft·lb
Others
5 mm bolts, nuts 4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb
6 mm bolts, nuts 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
8 mm bolts, nuts 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb
10 mm bolts, nuts 35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb
Slippery
Slippery GRM+ Memberand SuperDork
9/29/19 9:22 a.m.

Now I understand where those casters that you bought at Harbor Freight without a coupon went to. 

How loud is this thing when running? Is it quiet like most Honda gensets?

TJL
TJL Reader
9/29/19 9:26 a.m.

Ive messed with quite a few small hondas and didnt know of these flatheads. Cool. 

I looked into buying a non-running old honda generator at auction. Decided not too as the engine parts were quite expensive and i think some were NLA. Id rather have honda but these craftsman/troybilt ones are so cheap and easy, 

jfryjfry
jfryjfry Dork
9/29/19 9:35 a.m.

Is it too much to ask to check with the new owner and pass along the cause of the no-start???

Woody
Woody GRM+ Memberand MegaDork
9/29/19 9:52 a.m.
jfryjfry said:

Is it too much to ask to check with the new owner and pass along the cause of the no-start???

I filled him on all the details that I knew of and he said that he will send me updates as they become available. 

Woody
Woody GRM+ Memberand MegaDork
9/29/19 10:02 a.m.
Slippery said:

Now I understand where those casters that you bought at Harbor Freight without a coupon went to. 

How loud is this thing when running? Is it quiet like most Honda gensets?

Good call on the casters!

It is not as quiet as the modern Honda generators, but it has a governor on it that drops the idle based upon demand (or lack thereof).

Woody
Woody GRM+ Memberand MegaDork
9/29/19 10:03 a.m.

This is almost exactly the same as the generators that we used to have on the firetrucks. Modern trucks have them built in now.

Woody
Woody GRM+ Memberand MegaDork
9/29/19 10:04 a.m.

In reply to TJL :

China seems to be filling in the gaps on NLA stuff these days.

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