Kimjon

Added a silencer, mainly for the restriction as my "stinger" (outlet side of expansion chamber) was too large in diameter. The additional benefits of a silencer is ummmm....added silence;) pretty happy so far with what I've made.

Hell yes! Exactly the look I was trying to achieve, like a 90's MX bike (yz, cr, kx, rm125 etc...) So next up on the list: 1) Cut the top of the cylinder head off. 2) mill/lathe cylinder head to get right deck and compression ratio. 3) port the fuck out of it 4) fit s domed head kit to replace the top of the cylinder that's getting cut off 5) fit a much larger diaphragm carburetor Then pretty it up and ride!

Expansion chamber in the making. I want exaggerated proportions on this Goped. Trying to bias the bulk out one side to over inflate its looks. I took several (as in I've been fucking around for 2hrs) attempts just trying to find the best line for the exhaust to flow. I'm settling on this look, as I personally think it compliments the motor and look I'm going for.

Got a little bit done. Motor is now mounted, tacked together and sitting well. This Goped was never designed to use a chain, so I'm offsetting the centerline of the wheels by about 10mm to allow room for it to fit. Hopefully this won't be an issue, but theres only one way to find out?

V-twinstroke?

On a random side note, I did a mini spring clean of the shed today. I had accumulated a rather large pile of ever increasing junk taking up a bay for no good reason. Amongst this was a project I rarely look at...so I removed the covers to reveal it for a look... Fuck yeah...seriously...fuck yeah!!! Makes me wonder what the fuck I'm doing spending time on gopeds when I could be putting the finishing touches on this 99% finished harley? Someone kick me in the balls!!!

After much thought, I'm going to put a CAG 49cc motor on it. My main reasoning for this was, I'd have to destroy a perfectly good pocket bike to put a C1 polini (replica) water cooled motor on it. I just dont have the heart to ruin a working bike just to get the motor - when I have two CAG motors sitting there in bits. So, I made a start... Here's the goped. Purchased as is, missing the motor. CAG motor getting a 6mm thick steel plate attached to the bottom of it. This will enable me to weld a strong pivot point to it. Close up of the OEM engine mount. This pivot held the motor, there was no clutch as in a centrifugal clutch. However the wire cable tensioner literally pulls the motor directly onto the tyre and transmits power via a friction drive spindle. To start, you push it to about a walking pace and then tension the motor down to contact the tyre...then you can stop pushing and the motor takes over. Pretty clever low tech solution. I'm going to do away with the friction drive system and transmit the power to the rear wheel using a chain drive via a centrifugal clutch. This has a number of advantages over the friction drive, and also solves the main problem with my motor spinning the opposite way to the OEM motor. I'm going to weld my steel mounting plate to this OEM pivot. I'll cut it to a suitable size to lower the motor down to provide a strong engine mount. I'll replace the cable with a spring and this will provide a constant chain tension. So that's the plan...

Those are very good reasons. I just work on the theory that accidents happen to other people and not me...so I should be sweet as:)

They're breeding like rabbits! Plus another one on the bench as a "work in progress". Waste of money you say - can't argue with that...but some people gamble or smoke that amount in a month, so there's worse habits out there I guess?

Shit hot! Just carjamed it and first registration was 22 May 1964...sweet!!!

Thanks. Yeah confusing eh... Think I don't need them, may have to double check registration dates, as it may have lapsed then been put back on etc...

Seatbelts? I've googled but end up with complicated tables of rules I don't understand. I was under the impression that pre 1972??? You don't need rear seatbelts if the vehicle never came with them? Is this right? Or kind of right?

Made this today, put together out of left over parts that have accumulated over the years doing other projects. It's been sitting in a pile of bits for almost a year on my work bench getting in the way everytime I try to do something... Pretty happy with it, making something out of nothing. Still needs a rear wheel, but I started it up and it sounds wicked!

Got it going with new gear ratio. It sheds the wheels spinning them with ease! Definitely worth the extra work to gear it at 6:100 in T8f. I need to raise it with thicker sleeves as I've bottomed out the chain a couple times on my driveway. Another 10mm ground clearance will make a world of difference. But hey, for 39cc it shreads!!!! Pretty happy with this one.

Had another visualizing session, just trying to balance it out as much as possible. Also found some solutions... Boy racer spec bonnet spacers...JDM as fuck! And my throttle system to operate twin motors simultaneously... I've thrashed my Ebay account once more - buying up a storm of cheap Chinese parts. Normal 6 week delivery time. So I'll grab some steel on Monday and start welding shit together, do as much as I can in the meantime for the win!

Very crudely. I only did a basic calculation with 100kg hanging on the hoop. Ignoring a heap of things just to get a feel for it. If you gave it a high stress value on the less than ideal welded joint, and a high shock value on the load being applied...it will still easily hold 25 people hanging on it (ignoring that the ground would fail first).

I brought my son this tempered glass basketball backboard for his birthday this week. Problem is I had no idea how monstrous it was in size/weight at the time of purchase (online). Slapping it up on a bit of 2" pipe wasn't going to happen. So: Trademe to the rescue again. An ex stadium spotlight pole at a whooping 180mm diameter, 10mm wall thickness and 5.9m length... "honest truth officer, I'm only moving it just down the road" Some "School-C" level mathematics and equivalent drawing talents soon had a design in place. Let's just say it has a generous factor of safety when I did the calculations for bending stress... And many hours later...cut and fitted, v notched for multiple weld passes...and shitted together using an arc welder. Not my finest work, I certainly wont be sitting any gasline or food grade welding tickets this week that's for sure... but I'm pretty confident it's not going to brake anytime soon. That's as far as I got today. Been up since 4.00am and just sat down now, so 14hrs of picking up and getting shit done today. Must be beer o'clock???

Okay, some progress... Mocking it up - will look similar to this. Yes that's right...and no you don't have double vision. Yup...twin motors...fuck yeah!!! Still lots to figure out and actually do in order to turn a collection of parts on the shed floor into a working trike, but progress is progress.

I chucked the new T8f sprocket in the lathe and took a 0.3mm skim off each side to bring it's thickness into spec. This was part of the deal when I ordered it. Here it is loosely mounted up. Luck of the Irish...everything clears where it needs too. Considering the first sprocket was almost half this size and that's what my design was tailored around - this was just dumb luck. But fuck it...I'll take dumb luck anyday, as I get my fair share of the opposite all to often. Ground clearance is tight, but it clears. I can put thicker sleeves on to raise it 10mm or so if this is really a problem? But think it'll work fine as is. Waiting on a chain breaker to arrive and then I'll sort the last steps out.

Bad juju in some cultures...hopefully No13 doesn't bring bad luck for me? More to come.

So, this motor just destroys chains! I was running a tiny pocket bike chain in 25h pitch. This works with a pocket bike, but not so good on this drift trike. I think my gearing ratio and extra effort it takes to turn the big rear axle adds a heap more demand for the drive chain. So @anglia4 sorted a new rear sprocket by water jet cutting it. I've upgraded it to a much larger size to reduce the load demand from a standing start. I've been away all week, but reception called me to say a few things arrived at my work (this being on of them). So looking forward to collecting it tomorrow. Meanwhile in anticipation, a spent an hour tonight making this: The one in the vice is the one I made. You cant buy these in T8f chain pitch, so I made one out of a 49cc mini mx bike part. This is what I started with. It required a fair bit of turning on the lathe to make it, taking it down from M10 to M8 and machining a collar to fit in the new clutch bell etc...but luckily for me, all the sizes required were smaller than the original part started out at.

Have you seen this? https://trademe.nz/marketplace/toys-models/ride-on-toys/scooters/listing/2293747834 Looks a nicely set up unit. Pretty clean and well thought out ideas. Perhaps adopting some of these design elements could advance your build?

Well it was a great day. All but one trike went flawlessly all day long. About 5hrs of redlining these poor motors with governors removed...and they just took all the abuse. The one trike that didn't go the distance was the Stu-trike. Weirdly it was a good problem I created...too much power! It just tears chains up... so I'm going to look into if there's something European made for these race engines? As the Ebay (Chinese) chain isn't strong enough to take the power of this trike. Anyway here's a quick cellphone vid: I spent the day riding, not filming so apologies for the lack of photos and vids.

We had a testing session tonight - epic!!! The trikes there were all humming along, many with bigger carburetors off pit bikes now fitted and doing wonders for these motors. The latest trike is insane once it clicks into powerband! It's all on tomorrow!

Holy-moly, if you look in the dictionary for the phrase "world of difference" you see a picture of this trike with it's new rear sprocket! Fucking hell this thing screams!!!! Fried the tyres/sleeves and revved to max just like that! So cool...