1973 Yamaha TX 650 Troubleshooting, Repair, Maintenance & Tune Ups – Fixya

6 Jun 2015 | Author: | Comments Off on 1973 Yamaha TX 650 Troubleshooting, Repair, Maintenance & Tune Ups – Fixya
Yamaha TX 650

I have a 1973 Yamaha tx650 that I turned into a bobber. Straight pipes off the engine. When I ride it, the engine begins to lose power and bogs down, and back fires around 60 mph. even with the throttle fully open. (A mechanic friend of mine recently put in a fuel filter and carb rebuild kit.) After it bogs down and spits, it does it almost the whole ride home as if its dying. and stalls here and there. Once I get home, I pull the plugs and they are black, sometimes even burnt.

Any suggestions?

1974 TX500, high idle, white smoke from breather tube HelloI have a question regarding a 74′ Yamaha TX500. I have just had it serviced (its been sitting for 25 years). Carbs rebuilt, one new (used new) ignition coil, and a cleaned gas tank.

The bike runs fairly well, but I’m having two problems. First, when the bike gets good and warm, it idles to 4000 and wont come down for quite some time, and when it does it stalls. Second, there is white smoke with a gassy smell, quite a bit of it, coming from the cylinder head/crankcase breather tube located on the left side, top, and back of the engine (routed down under the bike).

Any ideas?

The idle problem is a lean fuel mix caused by an air leak in the intake system. Bad gaskets /seals on the intake manifold, bad valves, bad piston rings, loose spark plugs, and bad head gasket are all things that can lean the fuel/air mix. The smoke indicates a need for new rings. I would have the cylinders bored then install new pistons and rings. Now finish the top end work by getting a valve job.

You should get a liquid fuel tank liner to eliminate any rust problems in the future. Also, install an in-line fuel filter. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html

My complements on the well cleaned carbs. Do the work mentioned above an you will effectively have a new engine.

backfire thru carb and exaust. points and timing problem I need instructions on setting the points and timing on a tx650 1973, can anyone help me with this?

Okay, I will tackle a tune up on a 36 year old Yamaha. Warning: I am 59 and haven’t touched that bike since I was 23 and a mechanic at Lynns Yamaha in D.M. Iowa. Your bike has CV carbs and I know very little on the carbs .

First let me suggest you get a service manual. Go to www.repairmanuals.com and input 1973 Yamaha 650 . You can choose a Clymer or a Haynes manual. I don’t care for Clymer and have never used a Haynes. The Haynes is $23.77 which is really a pretty good price considering not many of the manuals still exist .

Yamaha TX 650
Yamaha TX 650

Also, for future reference, go to the following site where you can see a parts diagram for your specific bike. You will select the brand, year, model, etc. once you go to the site. Part numbers and prices are also shown.

Parts can be ordered if the price is shown no price = the part is not available.

Also Google motorcycle salvage yamaha and Google vintage yamaha motorcycle parts .

Start with new NGK B8ES spark plugs. New points can be gotten at the Babbitts site. Set the points at .015 max opening. Hook a timing light up to the left cylinder. Remove the left case cover to expose the flywheel.

Start the bike and point the light at the static reference mark on the casing. IF I RECALL CORRECTLY, rotate the base plate that the points are mounted on to adjust the timing. The timing should advance when the engine is reved up.

If it doesn’t, the spark advancer needs service. Now put the light on the right cylinder. IF I RECALL CORRECTLY, changing the right cylinder point gap is the only way to set the timing for that cylinder.

I hope this helps. Please rate my extra long answer. Thanks.

Yamaha TX 650
Yamaha TX 650
Yamaha TX 650
Yamaha TX 650
Yamaha TX 650
Yamaha TX 650
Yamaha TX 650
Yamaha TX 650

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