Look for a thread named "Every time I ride it something breaks". I fixed everything that broke, but I'm looking to sell it as I got a 70cc 2 stroke happytime. Probably also going the SBP shifter kit as well
Without the numerous fixes I have done - they are truly shyte. See below:
I bought this kit about 4 months ago as a cheap way to get to work - Its a blackstar kit (like the ones advertised for $450) - basically a copy of a Golden Eagle Bicycle Engine kit (link). Its a 4 stroke engine, a copy based on a Honda GX31 - stated power output (written on the side) is 200W, so *technically* its legal (you could claim ignorance), but the engine is really 700W (~1hp) output.
Once it was run in, with 10W-30 Penrite oil, and running on premium 98 octane, NGK sparkplug and highflow air filter (ie. its current condition) it uses 1 tank of fuel (900cc's - at 1.50 per litre = $1.35) per 60 klms, with the average speed of 45-50Kph on the flat easily. Its great fun on the road, and even more fun to throw on the (supplied) offroad gear, and do some bush bashing!
I have changed a few things from the original design, due to 'teething problems' I experienced with the kit (now all sorted).
1) The original design didn't suit a bike with caliper brakes very well, it had to be tilted back so that the belt cleared the brake mounts - The problem with this is that you couldn't fill the fuel tank more than 1/4 full or it would leak in the heat (out the vent on the cap) and you had to hold up the rear of the bike when filling the fuel tank - this has been fixed by making new fuel tank mounts that allow the filler to be on the exhaust side, rather than the intake side. You can fill the tank all the way up at the service station now!
2) Replaced the supplied bolts that hold the motor to the main frame with longer ones, better lock washers and nylocks after the stock ones came loose and the belt shredded against the mount and snapped (and broke the crappy plastic belt cover).
2) Replaced the fuel hoses (the rubber one goes hard and cracks, just sucks in air) with silicon TYGON hoses (the best).
3) Replaced the fuel filter with a smaller one from a whipper snipper as with the old one, and a low tank of fuel, the filter starts sucking air in corners and the engine stumbles/dies.
4) Changed the sparkplug from a chinese no-name to a genuine NGK CR5HSB after it developed a misfire.
5) Replaced the carburattor diapraghm + seals with a genuine Walbro WYK rebuild kit to fix a surging/flooding problem.
6) Applied blue locktite to all the bolts that keep coming loose on the engine ad-nauseum due to vibration.
7) Replaced the standard 'thin' belt to a thicker one - better for offroad use (11 tooth has much higher torque - broke one of the thin ones with it).
8) Fitted a highflow air filter - made about 3 kph difference to the top end speed.
9) The clutch bell is a truly poor design - Made from pitbike components, but the major thing that they didn't do well was to make the centre bolt longer - and put a nylock nut on the end - they welded it to the bell - so you down a hill while accelerating (it will top out at about 72kph) and let go of the accelerator and the clutch pads dont let go - you engine brake, and this snaps the weld, and unscrews the pulley!
I welded it twice before I gave up on the welding - Drilled through both the bell and the bolt, threaded it with a M4 bolt, used blue locktite on the main bolt and the M4 bolt, and silver soldered the *******. Its not going anywhere now!
I'm putting my kit on Fleabay with all of these fixes for around $300 - can sell here if you are interested...
