Guypie

You took the basket off the front? How are you supposed to take your teddybear places now? Hahaha

Change the plugs, they do fail. probably not the cause of the problem entirely but another thing off the list. I had one that the spark was jumping the gap at the base of the insulator, spark getting to plug but not firing the cylinder.

Stick a bit of oil in the bores? dunno if it would work so well on a car engine, but thats what I did on a scooter motor once when it had no compression after rebuild and it worked. Once it got started bedding in it was ok.

I changed a couple of valves the other day, pliers worked mint. putting them in is easy, removing the old ones is much harder.

Any updates?

I learnt about this about a year ago, was considering building one for a velobike but too much burn risk. Might still give it a go at some point, I never fornd half as much information on designs than you though, cool to see someone building one.

Yeah this is what I meant, thats what happens when you post just before going to sleep! Though reverse steering could be a fun brain exersize...

would something like this work?

Good to see somone else on the metal melting bandwagon. I will post up pics of my budget as home made furnace when its finished, prob get it done this weekend. As for zinc, it is safe as long as you dont get it too hot, the fumes if it does get too hot are visible (white or yellow smoke) and it is zinc oxide, which will make you sick but not arsenic sick. Also with a chimney any traces of fumes at low temp will be taken in by the pull of the chimney. As for the slag i read that calcium chloride is a good flux for zinc, and it is sold cheap as chips as pool water hardener. This website has heaps of info, it is very dry reading but super handy for all sorts of metalurgical info http://www.keytometals.com/page.aspx?ID=MaterialBasics&LN=EN

Emulsion tube is the bit behind the main jet like a perforated tube right? I have never thought about the effect it has on the bike before, i didnt think it was used to correct fueling. What do you change about it? Number of holes and hole diameters i guess? And what effect does it have on the fueling? Thanks mikey, you will have to come over and take it for a ride next time you are in town

Also i have a few syringes you can borrow if you do want to cc the head

On my briggs and stratton i skimmed as much as i could without the valves hitting the head. Doesnt detonate on 91, but i had planned on moving to methanol so that was never going to be the problem. Not really relavant but theres my 10c

I might try what governorsam said and take the jet out altogether, what could go wrong?! *queue burning valves and thrown rods*

First person to do 10 laps of the drome and 10 laps of the lake on the same engine wins Edit: sorry for spamming up your thread

Sweet. New sport idea: dingydrome 2014.

Then attach wheels to the boat and race it around a velodrome? Sounds awesome!

So jetting is currently at 140 main and it sounds good at high rpm on methanol, but the idle circuit doesnt flow anywhere near rich enough so i need to try boring out the idle jet/ replacing with a larger item. Idles mint on petrol but wont revv as its way too rich for petrol on main. Awesome. a bike that wont run correctly on either! hahaha edit: added pics beacause pics. and one with a megaphone exhaust

Ok so here is what I got done before last weekend. Step 3 Phase 1: Goodbye tiny carburettor Hello Bigger carb and new manifold: And Step 3 Phase 2: This was going fine until my pullstart started seizing up, and ripped the pullcord after screeching like a banshee, hence no go at the drome also, the flywheel came loose at munched up its key, so i had to replace that too. anywho its currently running a bit lean at main on 66%meth 34%petrol on a 120 jet size. Im thinking 140 at 100% methanol will be about right, apparently the tuning window is quite large on methanol so rich is good. anywho as usual any advice on tuning or ideas let me know!

Ok so at dromeageddon 2 I got this thing to 74kmh, and have not broken that since. I really need to make progress as my local competition (mr boswell) is only a gear ratio change away from blowing me away, he has 50cc more and is topping out at the same speed, but with more accelleration. So I have devised a 3 step plan as follows: step 1: I paid a visit to a friend and had the head skimmed buy 1mm. its quite a bit, but the valves dont hit the head so its all good. step 2: remove the forced air cooling system, after all the bike is moving and the fan is taking precious horsepower! This is the new fan shroud, i have not gotten around to machining the flywheel yet so hopefully if i make sure this is relativley well sealed the fan on the flywheel will just "cavitate" and not pull and air in. there was a plate in the casting at the front of the motor that would stop all airflow from the front, so i removed that, here is a picture compared to an unmodified engine: Note the front air vent had been blanked out: Step 3 still to come... and heres some other pics of the bike: at the Kawhia: and in B&W:

Well anythingspoked seems to be well and truly defunct so I figured I would move this over to here. Hi all I have been keen to do one of these for a while so I got cracking during the holidays. Unfortunately i was too damn lazy to take photos through the build so im just going to show you the finished product Muffler is a home made slip on jobbie to avoid irritating the neighbours. stuffed it with newspaper cause i didnt have any fibreglass. Has worked fine so far, dont know how long til it disintergrates tho Build came in at under $100! Its made from: 2x 20" bmx bikes from the dump shop 1x 2 or 3hp (unsure which) donkey engine. I think its 127cc .Has a centrifugal clutch. Bits of steel from the dump shop Couple of vee belts Pulleys came from work - fan belt tensioners etc Tank came off a Honda ct125 apparently. and carb is from a nifty fifty. could do with a bigger one though Currently have not tested top speed cause I only just put not-perished tyres on it but I have had it to 50km/h and its just getting started. i think it will do 70 with its current gear ratio (8.6:1) I have made another pulley to gear it up a bit for better take off. If anyone has any bright ideas on giving it a bit more grunt let me know! Chur Guy More early pics

Yeah wasnt really wanting to do chrome, from what i have seen its about a 50 step process too. Screw that!

Has anyone set up a homejob electroplating rig? It doesnt seem too hard to do zinc or nickel plating I was just wondering if anyone here had actually tried it. I have tried electrolytic cleaning, it worked ok ish, good for cleaning motorbike gas tanks but not much else. I found an instructable for nickel using vinegar www.instructables.com/id/High-Quality-and-safe-Nickel-Plating/step7/Common-Questions/ And read up on zinc plating a while back and have been stashing away zinc stuff that i find ever since Any result pictures would be much appreciated

Cylinder gaskets I replace, just make them out of gasket paper/ weet bix box. Headgaskets i reuse

If it has 2 wires one is ground anyways. Usually it just means the primary and secondary are earthed seperatley. Well as far as i have seen anyways, i could be wrong.

Should do. On one of my old suzukis i just tried hooking each of the wires coming from the stator to the coil and kicking it over. I got spark on about the 3rd wire haha. If you have a oscilloscope or a nice multimeter you could probably find the one with the pulse using that. Past that you would need to look into cleaning the points/other reasons why it may not be sparking.