Zman
Platinum Level Site Supporter
I was playing with some different CDI units on our 2004 DE300 and my 2000 XC327 big bore. Both bikes had the original CDI units with black heat shrink. The one on the 2000 was the older box shaped style.
I tried a 2011 250 Six Day dual map on the 2004 and while the dual map button made a minor difference between settings, both settings were considerably more pipey than the original CDI and it put a noticeable hit at about 2/3 up the power band. It also added a little more high rpm over rev. It gave it more of a MX power band that would be fun for open fast tiding but would be a bit too much in tight woods.
My 2000 327 has always had a super linear power band that I could lug like a 4 stroke enduro bike. While it had great power down low and through the mid range and a modest top end, it signed off about 1000 rpm sooner than the 2004 DE300.
I had two CDI options to try on the 327, a blue heat shrink CU7490 and a yellow CU7460 off a 125. I tried the yellow first. I was really surprised how big of an impact it had on the overall power band. The power came on a lot harder just above idle, pulled very strong through the mid range and it added a MX like hit in about 2/3 up the power band. It gained about a 1000 rpm on the top end and revs similar to the 300 with the dual map Six day CDI.
On the down side the yellow version had a negative impact on the low rpm luggability. It seemed to stall easier where it was very difficult to stall previously and it was hard to modulate the power as it came on hard and fast so it spun to easily in technical wet hills.
Later I tried the blue version and it seemed to be a nice mix of my old CDI bottom end power and still has the gained a bit of a hit in the upper rpm and it gained the extra high rpm over rev it never had before.
I think this is going to be a bonus for the Michelin tire company.
One more thought, those old stock black heat shrink CDI units could help out the guys looking to tame their 300s.
I tried a 2011 250 Six Day dual map on the 2004 and while the dual map button made a minor difference between settings, both settings were considerably more pipey than the original CDI and it put a noticeable hit at about 2/3 up the power band. It also added a little more high rpm over rev. It gave it more of a MX power band that would be fun for open fast tiding but would be a bit too much in tight woods.
My 2000 327 has always had a super linear power band that I could lug like a 4 stroke enduro bike. While it had great power down low and through the mid range and a modest top end, it signed off about 1000 rpm sooner than the 2004 DE300.
I had two CDI options to try on the 327, a blue heat shrink CU7490 and a yellow CU7460 off a 125. I tried the yellow first. I was really surprised how big of an impact it had on the overall power band. The power came on a lot harder just above idle, pulled very strong through the mid range and it added a MX like hit in about 2/3 up the power band. It gained about a 1000 rpm on the top end and revs similar to the 300 with the dual map Six day CDI.
On the down side the yellow version had a negative impact on the low rpm luggability. It seemed to stall easier where it was very difficult to stall previously and it was hard to modulate the power as it came on hard and fast so it spun to easily in technical wet hills.
Later I tried the blue version and it seemed to be a nice mix of my old CDI bottom end power and still has the gained a bit of a hit in the upper rpm and it gained the extra high rpm over rev it never had before.
I think this is going to be a bonus for the Michelin tire company.
One more thought, those old stock black heat shrink CDI units could help out the guys looking to tame their 300s.
