Mikes New bolt on 750 Kit

Loco · Posted: September 17, 2008, 1:16 am Post subject: Mikes New bolt on 750 Kit

Hi
I'm thinking of freshening up the old x650b
by possibly using mikes new bolt on 750 kit
anybody tried it any advice,
will the standard head be fine etc
thanks in advance
j

BiffTirkle · Posted: September 17, 2008, 6:51 am Post subject: Re: Mikes New bolt on 750 Kit

yes, everything should be just fine. i havent gotten around to installing mine.

theres a few things to think about when putting that kind of power and money in a bike.

1. bigger pistons, i bought mikes hardened performance rods for my engine.
2. why up the piston size without giving the head any improved performance. i got the performance cam kit, along with the performance valves.

i figure if i am going to put a sweet ass kit like that in my bike, then i want to make sure that my rods can handle the extra stress. you can hold off on the head. since you can pop that off and refresh it later.

Loco · Posted: September 17, 2008, 8:16 am Post subject: Re: Mikes New bolt on 750 Kit

thats what I thought which is what I will probably do
Xs650 performance are doing an a limited amount of specialist heads
an I'm on the list probs are that the bike is gonna look like s#$t but go like a rocket
cheers
J

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

I have been reliably informed the standard con rods will handle the 750kit, assuming the engine hasn't been over revved causing little end damage......I would port the head first then look to any other improvements second.........the biggest problem to the motor when installing high performance gear is the crank seperating due to high revving.
For my mind a 750kit, mikes 5th gear, ported head, and regearing the rear wheel. Performance when needed + fuel economy for those long trips without putting to much stress on the crank.

Loco · Posted: September 17, 2008, 7:13 pm Post subject: Re: Mikes New bolt on 750 Kit

Hi all of the above is want i intend to do
great idea about the mikes 5th gear
but I thought it would only fit the 533 engines (unfortunately)
hey Mike if your listening plEEEEse make a one to fit the most used 447 engine
J

Loco · Posted: September 17, 2008, 7:15 pm Post subject: Re: Mikes New bolt on 750 Kit

please replace would with could ta

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Hey Loco, The gearbox was changed during the 447 range. The box with groves cut into the tops of the gears will take the 5th gear. On Mikes site he states 78 and on, that would be standards and specials

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Could always get a later model gearbox. Do you belong to the 650 club

Loco · Posted: September 17, 2008, 7:31 pm Post subject: Re: Mikes New bolt on 750 Kit

certainly do
your self ?

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Yea, About 7 of us up here in the north, hope to make it to next years AGM, i'll have my bike set up by then, be riding down

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Up around the Cairns region

xsjohn · Posted: September 17, 2008, 7:42 pm Post subject: Re: Mikes New bolt on 750 Kit

Don't for get to retard the timing....at least play with it so you can become aquainted with what works best....these are timed advanced as far as I am concerned......take off with tall gears is helped a lot if it can rool off on the lower revs smoothlya bit retarded and at 2500 it rolls up ..................

xsjohn

Loco · Posted: September 17, 2008, 8:45 pm Post subject: Re: Mikes New bolt on 750 Kit

the Cairns crew I've seen ya photos on the webs site,
bugger I was up at Pt Douglas only a month go with work
and was going to make contact with you guys just ran out of time
hopefully I'm going to try and make it to the AGm as well
you going to ride the whole way ?
j

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Yea i plan to, take a few days and enjoy the ride. Shame you ran out of time, if there is a next time get in touch even if you can't get out to meet. Any little excuse for a barbie, and bullshit about the XS

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