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18 May 2014
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Programmable TCI unit for the XT600E
I just found this programmable TCI unit for the XT600E on the HPI.BE website..
This actually is very interesting, keeping in mind that the ignition curve on the later XT600E is pretty soft. Regulation thing no doubt.
Maybe this unit can get a few extra HP out of a XT600E ? What do you guys think?
HPI | Horse Power Ignition
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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19 May 2014
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I looked at the web page you indicated. Looks like you can get it programmed for 2 advance curves and select either. I responded to a request for the advance curve for the 80's CDI XT600 for a guy that was buying one of the HPI's. He wanted to see if more power could be had with a better ignition curve. Sounds like a good idea, I'd order one with the stock curve and the older CDI curve and test between them to see. You certainly need to be concerned about pinging or detonation with a more advanced ignition. Perhaps even switching to the lesser advance curve if you can only get a poor grade of fuel at times.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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19 May 2014
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Thanks once again Steve for excellent info. The XT600E has nice torque but it is not that powerful. I have a honda FMX650 (basically a streetbike or semi-supermoto with the old XR650L engine). The power difference is big, once the FMX650 had been uncorcket. Touring Ted had told me all about this, and he was not wrong.
Both engines (XT600E and XR650L) are in mild trim, low compression etc.. The XT600E is one fine bike, but it would get so much better, even with only 3-5 hp more.
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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19 May 2014
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
Last edited by steveloomis; 19 May 2014 at 23:44.
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20 May 2014
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Real world experience
Claims aside, has anyone installed one? Noticeable performance improvement?
I'd like to get more pop instead pulling like a tractor.
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21 May 2014
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I think we all like more power. It can be had for a big price. Higher compression, more agressive cam timing, heavier valve spring to handle the cam, better breathing with larger valves and ports cleaned up, bigger carbs, free flowing air filter. It takes a concert of cooperating changes to achieve a sizable power increase. The down side is, shorter engine life, and just a more cantankerous bike.
I like the longevity of the current engine and can do with a little less power. We'll see how my 86 and 84 compare when they are on the road together.
Steve
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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