Hi Joe. I just just checked mine. The # is 4HH-8591A-00 & it's the faster
red '93 model just like yours. Funny thing is, I called up the previous
(original) owner & he told me that he never had the ECU changed.( He had
originally told me about a flat spot in the aprox. RPM range everyone
keeps mentioning but I don't really know first hand. Yet ). Ride safe.
Peter Piazza
----- Original Message -----
From: "Loss, Joe" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, July 16, 2001 2:12 PM
Subject: Re: Surging curse and cure/Lets take a Pole
> I have a '93 and mine has never surged. It hesitates sometimes
accelerating
> from a closed throttle but never surges. When I bought my bike the
previous
> owner mentioned something about some part of the electronics being changed
> out already to improve the bikes running. I wasn't listening too closely
at
> the time but I think I know what he was talking about now. I just checked
my
> ECU. It has a label on it with the part number listed as 4HH-8591A-00. I
> notice that the microfiche parts catalog (which I'm pretty sure is based
on
> the 1993 model) lists the number as 4BH-8591A-00. Also on
> Buymotocycleparts.com the 4BH number is not listed but the 4HH one is. My
> guess is that the 4HH is an upgrade from the 4BH. Not sure if it was
> standard on the '94s or not. Anyone with a '94 care to check their ECU
> number?
>
> BTW I'm at 5,700 ft and regularly get up to 11,000 ft without any
problems.
>
> Cheers Joe.
>
> -----Original Message-----
> From: Boman, Jeff [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 16, 2001 10:02 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Surging curse and cure/Lets take a Pole
>
>
> Can anyone confirm if Yamaha changed the ECU part number between 1993 and
> 1996? Chances are that they didn't but I thought I would ask. The 1993
ECU
> part number is 4BH-8591A-00-00.
>
> Jeff B.
>
>
>
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