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Introductions / Re: New to the Forum
« Last post by Paulval on September 19, 2019, 02:20:49 PM »
The frame and engine numbers match, 1H2 000732
Bike has wire wheels and single disk front and rear
Not much progress so far, had the frame and swinging arm powder coated, replaced the swinging arm bearings, stripped cleaned and rebuilt the back mudguard (how does the plastic tool box attach to the metal rear mudguard?)
Nice easy stuff to get back into the swing of things!
General Discussion / Re: Removal of balance chain TX500
« Last post by dave835 on September 18, 2019, 03:27:35 PM »
 I tried this very experiment at and the bike was very snappy in acceleration , but the vibration was incredible ! The needles on the
gauges literally disappeared from 6000 to about 9000 rpm , they were shaking so fast . The buzzing in the bars was intense , very fatiguing , and I would not recommend it .

General Discussion / Removal of balance chain TX500
« Last post by Garn on September 18, 2019, 03:24:25 AM »
I seem to have have read a while back that, you can run the TX500 without the balance weights turning in opposite direction to the crank!
Meaning running with the balance chain removed.
Anyone heard of this and what is the consequence regarding vibration with this out of balance running?.
I realise it's a four stroke motor and the pistons are 180 degrees apart.

Any comment?
Your Bike / Re: My TX500 cafe project
« Last post by deadpresident on September 18, 2019, 03:14:13 AM »
I had to make the top frame tubes ( the ones in either side of the central backbone) removable in order for the engine to be removable. The Honda frame only had a large, single backbone, so there was more room above the engine. So that's what I did. I still need to drill and tap the holes for fasteners, but the hard part is done.
The picture (if the link worked) doesn't show that I also got the rear motor mounts welded in, as well. Now on to the front tubes, and to box in the area under and to the rear of the engine.
Fuel System / Re: 74 TX500- completely dumbfounded
« Last post by guylr on September 12, 2019, 03:28:50 AM »
There are checks for rectifier function but it has nothing to do with the ignition or starting. If your battery is staying charged then look somewhere else for the non-start problem.

Fuel System / Re: 74 TX500- completely dumbfounded
« Last post by CallaghanWilliams on September 11, 2019, 10:36:43 PM »
Also the electronic ignition unit is a newtronics brand purchased from
Fuel System / Re: 74 TX500- completely dumbfounded
« Last post by CallaghanWilliams on September 11, 2019, 10:35:14 PM »
Is there a way to check the rectifier if I can't get the bike to run?
Engine & Transmission / Re: Oil Change DIY
« Last post by CrouchyUK on September 11, 2019, 09:02:43 AM »
Yes- good spot on the 2 drainplugs- I must have missed this otherwise very helpful oil change write-up.

As an additional point- it is essential to replace the smaller drain plug with the same or identical?  You will have noticed it looks a bit longer on the threads than might be considered necessary for a drain plug.  But itís length also seals a side oil port that drains the crankcase chamber for the oil change- normally this port is blocked and the crankcase oil is pumped away by the oil pump.  Effectively these engines are dry sump.

We have had members tempted by these modern magnetic sump plugs- these are too short and the end result is that while standing the main oil charge drains back into the crankcase.  Symptom is having to keep adding more and more oil to get a level on the dipstick.  It took us months to figure this out!
Fuel System / Re: 74 TX500- completely dumbfounded
« Last post by Garn on September 11, 2019, 05:27:16 AM »
I'm thinking that original trouble, overheating of the coils, hence, being replaced. This fault may have been the regulator/ rectifier.... Check with bike running should range up to but not exceeding 14.0 volts too much, with bike running at 3000 Rpm. I would look there first!
Check petrol cocks are giving good flow, they do give trouble clogging up.
Here is an onside chance.... Some bikes have restrictors in exhaust and inlet from new. They are purely a large washer with a smaller than usual hole in them to restrict the speed and acceleration of these small bikes with young riders.
Another item could be missing small rubber o-rings or plugs missing from main jets (don't know the effect of missing these).

PS.. What type of electronic ignition?. Could be mismatch with electronic ignition and 3 ohm coils.
PPS.. Also check starting current of battery, although it seems to check out. Check if blinkers are slow and generally all electrical is working.vo
Fuel System / Re: 74 TX500- completely dumbfounded
« Last post by guylr on September 11, 2019, 04:20:41 AM »
Are the plugs coming out wet? If wet and you have spark are you getting any pops or kick backs on the starter lever? If so, suspect your electronic ignition timing. If spark but dry plugs then it's fuel related and you should double check fuel flow to the carbs.

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