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View Full Version : here is a bit of history


daveh291
04-23-2008, 06:06 AM
here is a article from Super Hunky.he tells the tale about the TM400.that bike was legendary for hurting people.it didnt handle and had a freaky power delivery.anyway,enjoy the reading.http://superhunky.com/TM400.html

P HAYES
04-24-2008, 07:22 AM
Sounds like my old SC 500. "The Widowmaker"

daveh291
04-24-2008, 10:33 AM
i read a 74 Dirtbike test on the TM400.it turns out the freaky power delivery is caused by the ignition system,the SC500 has the same style ignition system on it.it would go from a mild retard to full advance in one fell swoop.it would result in a violent surge in power.if the advance was progressive it would not have been so bad.as far as the TM400 goes,the ignition from a ts 400 is a bolt on cure.that system uses points.

P HAYES
04-28-2008, 05:59 PM
i read a 74 Dirtbike test on the TM400.it turns out the freaky power delivery is caused by the ignition system,the SC500 has the same style ignition system on it.it would go from a mild retard to full advance in one fell swoop.it would result in a violent surge in power.if the advance was progressive it would not have been so bad.as far as the TM400 goes,the ignition from a ts 400 is a bolt on cure.that system uses points.

Yeah,you had to make sure the SC was pointed straight before you nailed it and your buddy was not right behind you. I hit a guy in the collar bone with a rock and he couldn't hold on to the Suzuki.[doh]

motoman354
04-30-2008, 10:30 PM
Yes this is correct. What made the TM so bad was that the advance happened at about 2500 RPM which you always seemed to hit mid corner. The exception is the 1975 TM which had a 2 stage advance.

daveh291
04-30-2008, 11:44 PM
Yes this is correct. What made the TM so bad was that the advance happened at about 2500 RPM which you always seemed to hit mid corner. The exception is the 1975 TM which had a 2 stage advance.
and the worst part is that a change in the temp of the ignition parts would change the power hit.it varied 2 or 300 rpm.it would be hard to predict what it is going to do.

motoman354
05-01-2008, 03:31 PM
Sure did, I had a 74 and it was always fun in any technical sections. Caught me out more than a few times.