Stumble at 55

[jdross440]

While riding at a constant 55 (using gps), about 3100 rpm, for about 15 minutes it acts like 2 cylinders drop out. The speed drops and I let off and then bring throttle back up and it will run good for about 15 minutes and do it again. If I run faster or slower (58 mph and up or 52 and down) it doesn't do this. When I'm on 2 lane highways I like to ride at 55 to see the scenery (and that's our speed limit). Anyone have an idea why at this speed only?

[Prairiehammer]

Yep, it's the infamous 1990 'hiccup'. Mine did it at exactly at 3100 rpm or 55 mph in fifth as did several other people with 1990 Ventures. The hiccup will last just a second, though, for most everyone.

There is an apparent 'bug' in the TCI. When I swapped my stock TCI for the Ignitech, the 3100 rpm hiccup was gone. When I lent my OEM TCI to another member, the hiccup occurred on his bike.

There is no hiccup on my '91 at the same rpm or speed. Seems to be a 1990 thing.

[jdross440]

Will a 91-93 TCI work on a 90? Probably can't find one at a reasonable price anyway.

[Prairiehammer]

Will a 91-93 TCI work on a 90? Probably can't find one at a reasonable price anyway.

 

Yes, the 1990-1993 OEM TCI are interchangeable and supposedly the same, but something must have been changed between 1990 and 1991, for I have yet to hear of the hiccup after the 1990.

 

And yes, they are the most difficult to find.

[jdross440]

Since I now know this is a common occurrence and nothing is going wrong I will live with it unless I run onto a unit from a 91-93 at a reasonable price or I come up with the extra money for the aftermarket TCI.

Edited June 19, 2014 by jdross440

[suds]

I noticed this on my 1990 VR as well... good to know it's "normal".

 

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