Yes. Yes they do. Still looks like fun though. Over to your new thread I goOriginally Posted by jibberwobble
Who You Calling a Pig
Yes. Yes they do. Still looks like fun though. Over to your new thread I go
For the record Qkkid was in my bed, not the other way round
Scooter boy
It's funny how you get accustom to what you know, when I show people pics of minimoto's the laugh there tits off at me but to me it's completely normal now and they dont look odd at all but of course they are! I laugh just as hard inside my helmet when I'm blasting round though.Yes. Yes they do. Still looks like fun though. Over to your new thread I go
So will you be making changes to you're rig or just beefing it up for now?
Unknown Disorder
People look at us a bit odd for racing such small capacity bikes as well.
On it local kart track we only get up to about 90 km/hr but you can have a hell of a lot of fun at that speed and the racing is as close or closer than any other class. The budget on the other hand is nowhere near big bike racing.
The mini moto scene here died out about four years ago. I'm not sure why.
Pumba, have you got your rig back together again? Be good to see you next weekend if you have.
Stock is best
Who You Calling a Pig
Apart from stripping it all apart not a lot more than has been done. Every chance I have gone round to work on it I seem to have ended up splitting wood or some other chore for the oldies. Need to get it all straight again before I get a mate to weld it it properly.
No real changes planned at this stage. I have come to the conclusion that any major mods will just be throwing time and effort away on this rig and I wouldn't know where to stop if I started. I have ideas of grandeur and have a sketching up ideas for a new rig, but with a young family finances are a bit tight to do anything about it at the moment.
We are all allowed to dream.
Unknown Disorder
Pumba, that rig of yours would go much better if you added more heavy to it. Watching the video of the GP both you and Chris monster end us off the line, I recon we should all run homologated Loncin non electric start engines as a policy, at least until we get a better engine for ours.
Stock is best
Scooter boy
Mini's nearly died here a couple of times, it's still struggling to some degree but this year the racing has taken off a bit again partly due to a new series that started last year offering tv coverage and the like. I will have to get along to one of those but usually race with the British championship (if you can still call it that) as thats where the chairs are. I stopped racing mini's to concentrate on keeping the sidecar and my two boys going at meetings. Still hack about on track days though when money allows.
The chinese revolution created a boom then bust bubble over here with millions of scabby scrotes getting hold of crappy chinky death traps and terrorising the streets giving the whole scene a bad name.
You're in a very similar spot to me Pumba, my rig was hanging and needed stuff doing before running again at the end of the season but finances, family and work meant it had to wait til early this year. I had to either gob it back together 'til next time' or cut some big bits off and go in a new direction. I chose to go for the biggy due to it being a new year and not wanting to spend the entire season chasing problems and having loads more DNF's. Like you say Once I stared I just went for throwing all the experiments we wanted to try on it while I was there. There was plenty of reasons to continue developing it before building from scratch. Having taken my only rig to bits means I dont have any wheels to race on though.
In your position and with my own hindsight I'd do exactly what you're doing and make that bit a bit stronger and chug on for now, if you have old faithful still going you can mess about and build a new one slowly and as funds allow without being pressured into rushing it through.
Who You Calling a Pig
Well given all the discussion on here figured I would spill my guts on what I am thinking for the future, just encase some long lost aunt with all her millions (would probably settle for thousands, even hundreds would not go a miss) and has named me as benefactor of the estate (I did mention earlier about being allowed to dream).
Anyway, should I start from scratch I am thinking a short bike modelled on a modern F2. What I am pretty sure I will do is:
- Seamless Steel Tube Frame (anyone got any clues on sizes?)
- Length somewhere around the minimum wheelbase of 1300mm
- Wheel Track around the 800mm mark (for no other reason than it looks in proportion on my sketch)
- FXR powered (although if the cheater 85cc engines come in.........)
Wow, not a big list when I look at. The list of what I have questions about is much longer.
One of the big things I am changing my mind about is the wheels. Just because I really like the 10inch rims. But to be honest I am starting to reconsider this. kart rims just seem like the easier option from an engineering point of view. If I were to go down the 10inch wheel track you are talking the need to get customised hubs to accommodate disk brakes and a drive sprocket. Kart gear to a large extent like axles and hubs are available off the shelf. Just seems easier.
Something else that I had not thought a lot about until today was the alignment of the drive and front wheels. Always thought I would put them straight in line, but given we have the 70mm allowance in the rules, the pictures from jibberwobble and the realisation that the big rigs run some offset I am thinking that not utilising some of this 70mm offset would be a lost opportunity. But what to make it?
I think I would still run suspension. My gut tells me that there has to be some benefit to doing so. Leading link at the front with a swing arm at the back, although if I go with kart wheels there is probably a chance to have something a bit flasher at the front (I doubt that is needed).
That is about it for the moment. Might start writing shit down in here as it comes to mind so I have a record of it. It is as good as any note book as someone might have an answer or two.
Ta
Maximum offset is the best way to go. It's where pretty much all of your stability comes from.
Weekend cruiser
Hi Carl, re the kart rim option the front ends need some thought, a rear kart rim is fixed to the axle which spins in bearings but you need to go the opposite way and have the rim run on bearings and fix the axle. I couldn't make my own hub up and had to get Darren Morgan to fabricate one (I'm talking Henk and Ricks rig here) which holds the bearings and also has a flanged end to take a disc for the brakes. My blue rig runs the same set up. On Henk and Ricks rig I also placed the axle in large Rose joints to try and take out some of the misalignment in the forks. It sounds simple but it isn't something I could do with the required accuracy with the tools I had. The rig Chris got had the same sort of set up but was Only able to run an odd ball tire that would fit the rim is made up, it never had much stick, I think Chris,before he left, finally sorted a decent front rim/tire combo.
Check out those rigs to get the idea. I also tried to make up a leading link front end but due to the low axle height I was struggling to get the angles to work without fouling on my front rail, I doubt it would be worth the hassle to be honest, throw on a MG yellow and you wont get the front to lose traction to easily.
If you can make it to the track this weekend take mine for a run and see how it goes.
B.
In the riders seat
Front disc hub off a gearbox Kart has all that although you'd possibly need an axle to suit
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Hardcore Biker
[QUOTE=Pumba;1130721725]Well given all the discussion on here figured I would spill my guts on what I am thinking for the future, just encase some long lost aunt with all her millions (would probably settle for thousands, even hundreds would not go a miss) and has named me as benefactor of the estate (I did mention earlier about being allowed to dream).
Anyway, should I start from scratch I am thinking a short bike modelled on a modern F2. What I am pretty sure I will do is:
- Seamless Steel Tube Frame (anyone got any clues on sizes?)
- Length somewhere around the minimum wheelbase of 1300mm
- Wheel Track around the 800mm mark (for no other reason than it looks in proportion on my sketch)
- FXR powered (although if the cheater 85cc engines come in.........)
Wow, not a big list when I look at. The list of what I have questions about is much longer.
One of the big things I am changing my mind about is the wheels. Just because I really like the 10inch rims. But to be honest I am starting to reconsider this. kart rims just seem like the easier option from an engineering point of view. If I were to go down the 10inch wheel track you are talking the need to get customised hubs to accommodate disk brakes and a drive sprocket. Kart gear to a large extent like axles and hubs are available off the shelf. Just seems easier.
Hey Pumba have to agree best way to go for bucket sidecar is a simple frame and kart running gear, the only down side and reason i on sold the one i had to Henk and Rickis being a big guy my weight would upset the handling which doesn't seem to be an issuse with my current one. Although it doesn't seem to like doing more than a couple of laps.
Here's some tips for you if you go with go-kart running gear, use a 30mm or 50mm medium axle.
Run split rear sprockets which will make it easier if you want to change the gearing.
Treat it like a go-kart not a bike with reguards to gearing, i've changed the gearing on the one Henk and Rick own and Brentons one. Originally one of them had a 40 tooth rear sprocket and i think now their both around 24 or 27 tooth rear.
Scooter boy
20 and 25mm seamless is common in the uk. Bare in mind if you plan on bending it, bigger than that will be difficult without a hydraulic bender.
Agreed the smaller wheel base sounds fair to me on the agility front
Yep, kart gear can be pretty cheap second hand and most things are possible with regard to different sizes and methods of attaching things together.
My best guess would be to go for the max like Drew says
Surely suspension is only going to be of some real benefit if it is quality gear with setup adjustability? given the cost and complexity of getting it working well and the fact that super karts are doing over 200kph with no suspension on the same type of tyre I'm not convinced it's worth it.
My front axle is a piece of 40mm ally bar, bored out for bearing spacer tube, bearing recess in each end and 8mm woodruff keyway all the way down. I can slide brake disc carriers and wheel hubs up and down and nip up where needed.
You can also get wheel hubs with bearings in that carry brake disc carriers. And brake disc carriers with bearings that carry wheel hubs so thats two more methods to consider.
Scooter boy
Here's some footage of the little uk units let loose on a full size racing track, (mallory park) they are a bit lost on this somewhat featureless layout but after everyone whacked on their smallest rear cog they were stretching their legs ok and putting in better lap times than some of the older classic full size chairs. Richards was apparently going through the speed trap @96mph (155kph) which is quite amusing.
Shows that having no suspension isnt doing that much harm though I feel.
Who You Calling a Pig
Mate the photos that you have put up on here and the other thread have been awesome. Given me a bit to think about. Once I have collected my thoughts I will have to write another post.
Scooter boy
Thanks for the positive comments along the way guys.
Glad to help spread the word and promote our sport whenever possible dude, just happy I'm not sticking my nose in where it's not wanted!
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