Quote:
| Originally Posted by Rattler So is it fear of the awesome power, torque and drive of a 620 over a 583?  Or is it that that they weigh a ton? Or is it just to have a little bit more power means you have to be a little bit more cautious?  Or perhaps there's less to fug about with on a 583 and hence the tinkerers like you and Payne can really mess up a 620 !!!!  and slow it down. The answer? Only go near it to ride it..........and if it aint broke.......!!!  |
The trouble is the one I bought was broke and did not run any improvement on that isn’t really messing it up.
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.
With Only 55bhp on tap compared to my 583s 51.5bhp I doubt if its anything to do with the throttle opening after all it’s a pussycat compared to the TL1000S and 916 I raced in SoT and the Blades I ran in the Open and Powerbike. Paul P probably thinks the same of his 620 when compared to the 888 based bike he use to race in SoT
The Frustrating thing is I bought a crashed but complete M620Sie to turn into a race bike, it came complete with two black keys, the red master key and the code card yet did not want to run. I spent hours and hours going over everything to try and get it sorted, but there was nothing I could do with the standard parts, either the clocks or the ECU were prohibiting me from getting it to run. I tried the breakers for second-hand set-ups but there were none available, a FIM was outside the budget so I opted for the 750Ssie ECU route
My advice to others is to start with a running 620 that is either using a standard ECU or something like the FIM unit on Trouty’s bike or a bike with a proven record