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Messages - gsx600racer

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1
zx50 / Re: BBC kit initial tuning
« on: May 05, 2015, 12:26:18 AM »
Thanks Bettin,

I will try smaller jetting and put the stock airbox back on. Also will go thru carb and clean as well.

Before the BBC(stock cyl), the main jet was #90 and it ran good before the swap. It did have a little carbon build up on the piston and head.(pics attached)

2
zx50 / Re: BBC kit initial tuning
« on: May 04, 2015, 06:10:05 PM »
Thanks, leo. I have tried with and without air box and it runs the same. The carb is stock and I believe it is 14mm according to the manual.

I am looking at aftermarket exhaust and carb, any suggestions ?

3
zx50 / BBC kit initial tuning
« on: April 28, 2015, 08:08:39 PM »
I'v installed a Malossi 70cc kit. The kit claimed you could maintain the stock exhaust, carb and airbox.

I have ran one tank(fill) on break-in so far. I am trying to get it tuned in but having some dificulty gettting it to run decent.

At idle at a dead stop to around 20mph(1/2 to 3/4 throttle take off) it runs great.
Then at 20+ and pushing it to full throttle it stumbles over its self and acts like its going to stall.(I can not tell if it is starving for fuel or if its something else)

I am running stock carb(jetted at 96) and stock exhaust. I'v removed the stock air box and using a performance air filter. I'v installed the carbon reed that came with the kit. I am still running the oil injector pump and adding extra oil to fuel. I have also raised the needle in the carb. I had the top of the cylinder machined to bring the squish band in @ .04 inch.(i think .024-.031 inch was recommended). I chamfered all the cylinder ports

I have recheck the compression(180 psi). The spark plug looks decent(brownish but not sooted up). I have a camera to view inside of engine, there is a little carbon build up on top of the piston(on both side transfer port locations). I jetted back to #92 and its still having the same trouble

My goal was to gain more low end torque(climb hills better)hence keeping stock carb and exhaust. I am considering going back to the stock reeds too.

Looking for advice in which direction to go in.

4
zx50 / Re: Winter project, BBK
« on: October 31, 2014, 03:41:22 AM »
Hi Zombie,

Thanks for the feedback.

Was finally able to free up the bench to get my scooter on. Been busy resurrecting a late 70's Batavus Regency moped for a friend. They don't make'em like that any more. Forget getting parts for them, not much left out there for them. Fortunately just needed carb/tank cleaning, new chain, head light bulb, and a lot of tlc.

I got the engine removed from scooter, removed head/cyl & piston and was surprised how clean they were.

I need to get another shopping list together, need flywheel puller, crank seals, and wrist pin bearing.
Till then I have plenty to do.   

5
zx50 / Winter project, BBK
« on: October 20, 2014, 07:23:22 AM »
I purchased the Malossi sport 70cc kit(317200). The site claims this will work fine with stock carb and exhaust and should be able to retain oil injector pump(supplied with larger jet for carb).  Sorta disappointed that the kit does not come with a new wrist pin bearing.(seems to be the case with all kits) I want to replace with new.

Looking for some feedback. Tips, tricks, things to lookout for. Would like to do it once and right.

I am not looking to break any land speed records with this mod. I do expect to see some acceleration and hill climbing improvements.

My goal is to get kit installed and break in with stock carb and exhaust and then tune variator/clutch setup. 

I understand that a larger carb/intake, performance exhaust, and variator/clutch tweaks will enhance the bbk performance.(future project)

Thanks in advance.

 



6
zx50 / Intro and background
« on: October 20, 2014, 06:15:14 AM »
Hello all, long time reader first time poster.

I have a 2003 zx50 with about 8k km. Purchased last November. Was in need of some cosmetic repair. It was all stock other than the CDI de-restriction.

It was missing front turn signals and rears had missing lenses. I wired the fronts that were “built-in”with parts from a donner scooter. For the rears I just swapped harness to built-in ones.

It ran when I picked it up but had intermittent spark when going thru it inside a heated garage. I gave up on it till this past spring(was working on another scooter project) I went thru all electrical and could not find anything wrong. It would run on cool days and not warmer days, or ran good for awhile then died.(when things warmed up under the seat) So for the hell of it I took CDI out and put it in freezer for a couple hours and it would run again. I did this several times with consistent results. Replaced CDI and all is well. Maybe this info will help others when troubleshooting this issue. Was always under the understanding that CDI's work or don't work.

Anyways rode it this season and loved it. Acceleration, getting to cruising speed, and climbing hills are decent. For a 240lb rider I was impressed. Cruising around 40-42 on the flats, downhill almost 50, and decent hills 32-35mph.

MODS,

Replaced rear tire, was worn really bad on left hand side of tread. What a mess, previous owner used fix-a-flat. Tire was hard to un-seat bead from the rubberized fix-a-flat inside. Would recommend tire slime over fix-a-flat.

Have swapped out drive boss with Naraku 36mm. The one I swapped out was 36.94mm long.
Replaced drive belt with Gates PL20601(732x18.5x28)
This mod seem to take away take-off speed but did gain a tiny bit on top end. I put the old belt back in and seem I regained take off. I understand that the old belt is worn and sitting lower in the variator pulley and take-off is improved.

Wife and I both ride, she rides a 2001 Honda elite 50sr(the crazy restricted one)
I have de-restricted this scooter. Removed plate behind variator, removed(drilled out) washer in exhaust, de-carbonize exhaust(that was fun), up jetted carb, open up stock air box, and tie wrapped oil injector pump wide open(no second cable to oil pump. Runs great just smokes a bit at idle(oil pump wide open all the time)
 
Well that is where I am at and a little about myself and ventures with scooters.
I really have enjoyed this forum, a lot of great reads, advise and people.


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