Messages

1

General Two Stroke Talk / YZ 250 EFI

« on: March 10, 2013, 11:35:27 AM »

a ha! i know who you are now!!! yes chris did tell me you were a whiz with the machining! certainly appears so too, yes we did have the problem of running crap off the bottom, it took some experimenting with different size injectors and also some trickery with injection timing, at one point we were injecting three times a cycle and then adjusting the obvious duty cyles, pulse widths, we did get a nice smooth transition, we luugged it as low as 500rpm then cracked it and it was nice, however as we both have experience, low volts stuffs the injection calculations big time, i had the calculations down for injecter size vs pulse width vs flow vs voltage drop threshold, when i scribbled it out, it explained exacly what was happening, very important. depending on what size injectors you are using and what draw the rest of the link will suck, i found the stock fuel pumps in the crf, yzf 450 which were set at 43 psi on the internal reg to be great, they only drew 1.2 amps at full throttle and at one point took a 1000cc injector to 95 percent duty!! pretty good i thought.
am looking forward to your project finishing mate, top stuff.
am interested to see what trigger wheel and cps you end up using? are you going to do a full stand alone with this 250/360 or are you going fuel only?
cheers mark.

2

General Two Stroke Talk / YZ 250 EFI

« on: March 09, 2013, 10:49:34 AM »

thats some fantastic work there, i can only simpathise with the amount of hours you must be putting in with this project.
i would just like to add my ten cents worth regarding the yzr500fi. i feel its only right as i was the person who designed and built the whole bike, including its efi system.
the reason the bike ever eventuated in the first place was due to the fact, myself and my partner agreed to do it for free! yes for free.
the owner keith patterson who is now sporting a carburettor on the very same bike was the biggest hurdle in the whole venture.
frankly speaking the man is thick as two short planks and no amount of explaining or lodgic will ever sink in.
the reason he pulled the efi off the bike was down to being a tight arse, he would not shell out $600 for a stator capable of the current draw on the efi, so when batt voltage dropped below a certain threshold the bike word run ****. simple stuff. not for keith.
any how i turned my back on him. and now reside in australia, i have made numerous kits that all work fantastic, all port injected.
there is alot of time and research into making hybrid systems work such as these, i have no doubt yours will work great too, i can only commend people such as yourself.
i did not want to detract from your thread, however reading the part about the yzr500fi, that had to be put straight.

am intersted to know who you are? where abouts are you located?
cheers mark.

3

General Two Stroke Talk / Re: RIPPED OFF BY TOP GEAR MOTORCROSS

« on: July 18, 2011, 02:22:19 PM »

i too have atatempted to resolve this,there comuinication is vaugue and unresponsive,i have fellow hoons that have tryed,but no response...

4

General Two Stroke Talk / Re: RIPPED OFF BY TOP GEAR MOTORCROSS

« on: July 18, 2011, 01:53:01 PM »

I too am pleased to hear this,there needs to be integrity when dealing with people and there money and service.DO NOT USE TOP GEAR MOTOCROSS.i am not exagerating when i say that it is the poorest workmanship i have ever seen!!! please fellow hoons do not waste your hard earned cash on these chaps..................