Quote:
| Originally Posted by skidlids Going with the 750Ssie ECU has its problems, the rev limiter kicks in at 9200rpm meaning you have no over rev, also it is normally connected to injectors that are designed to flow 22% less fuel than those of a 620. Then there are the slotted/adjustable cam sprockets which means the cam timing can be all over the place. On one of my cylinders the inlet was opening at 4 degrees AFTER TDC when measured at 1mm of lift, the Standard Factory figure is 12 degrees BEFORE TDC, so having cams retarded by different amounts and by up to 16 degrees doesn’t help. |
Eh?? You've lost me there Kev after the word problems...
For what its worth I've done reasonably well in both classes. I found, as did many others, (Fil, Chris Wood, etc) the bikes to behave totally differently. Cobby has also rode both bikes and enjoyed the handling of the 583. The 583 engine has different weight and turning characteristics to the 620 so we found the bikes needed to be ridden differently. I've had to learn alot of racecraft with the 620 as it takes more care to ride faster than the 583 but once mastered you can cane it just as much as the 583 and pull 3-4 secs a lap (on average over the tracks) faster, but the 620 will bite back! As its going faster than the 583, its also more on the limit of the tyres.
Dont forget I have a very capable 620 for sale if someone fancies the transition.
This is just my opinion.
Andy