Thumper Club Forum
Technical => Project Progress => Topic started by: johnr on May 14, 2020, 10:00:36 PM
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Sort of, thumplet? Thumping? Is there a name for a smaller thumper?
Anyhow, sitting unloved at the back of my garage for probably 7 or 8 years now is a tatty Honda innovative. Now if you don't know what one is, the innovative is the follow up to the Honda cub. Single pot motor semi auto step thru. They are, its got to be said a pretty amazing wee thing. 100+mpg, 60mph cruising speed, smooth, 12v electric start 4 speed commuter. Bomb proof reliability and just a bit more of everything than the old cub due to its 125cc ohc engine. This one hasn't turned a wheel in years. But I had a plan.....
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for some reason whenever i try to add images to this post, the forum kicks me out. ive tried a half dozen times now and every time it wont let me, no matter how small or what format image i use, it doesnt reject the image, it just boots me out and i have to log in again. just trying to see if it lets me post just words.
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nope, id a completed project to post with a full set of pics of rebuilding the bike with new big valve head, big bore kit, aftermarket cam big exhaust, huge carb and a rake of other mods to make this a fun little scoot, but posting images on this forum is like trying to scoop air into a fucking heap so, well, i did it, and it runs but you arent ever going to see it unless youre on facebook.
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OK John, send me a PM or I'll send you a PM and see if we can sort something out!
My regards, Bill
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Tried it again tonight. Doesn't work. So what's the point in posting stuff if you can't post pics of projects alongside descriptions. I can't even edit stuff I've already written. So, I'm not going to bother with it any more. This place has got clunkier and clunkire over the years. In the time I was trying to post a single image to this page, I successfully uploaded 300 images to some albums on Facebook. This place is just too much like hard work now. So, I'll pop in and see what's happening, but I won't post any more build pics here, shame cos I was about to start on two big thumper builds! Ttfn chaps.
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Pity you can’t get the photos up John. I’d have liked to have seen the little beaut
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Johnr,
I have offered in my previous post to load some images/text if it is PC based. If you are using Apple or Android machinery, I am afraid I have no experience at all with them, so cannot help.
SteveH has set aside time to make an upgraded site, his posted 'WARNING' is at the top of the'entrance' page.
Please, dinnae get huffy wi' us!
Good health and enjoy wrestling with your 2 rebuilds.
My regards, Bill
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I second Bill - we need you here for your knowledge and evocative writing style (Silverwing sidecar memories - in Paris?)
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Tried it again tonight. Doesn't work. So what's the point in posting stuff if you can't post pics of projects alongside descriptions. I can't even edit stuff I've already written. So, I'm not going to bother with it any more. This place has got clunkier and clunkire over the years. In the time I was trying to post a single image to this page, I successfully uploaded 300 images to some albums on Facebook. This place is just too much like hard work now. So, I'll pop in and see what's happening, but I won't post any more build pics here, shame cos I was about to start on two big thumper builds! Ttfn chaps.
John, as has been mentioned I am working on change to improve on this. Whilst the solution is relatively simple I have had to move the whole site to achieve it, not quite so simple. I am fortunate enough to still be working and as with most people have many calls on my time, as such this is being progressed as an when I have time. Progress has been slow but steady and should hopefully be concluded soon. Your patience as ever is appreciated :-)
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Nice one Steve... i know how time consuming and tricky this can be, especially changing servers, which involves several outside agencies who don't necessarily do exactly what you want when you want it...
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i wasnt having a go at you steve. i just thought thats how the site was, and tbh it hadnt registered that you were working on the site to fix that specific issue, so please dont take my comments as in any way an attack on yourself. id just assumed the site hated me..........
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not just you.......
;-)
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quick test....
only real before pic i can find. this little blue 125 step thru has sat at the back of my shed for the best part of a decade, paneels missing, camchain rattling leaking oil. well used and unloved.
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ooooohhhh, it works!!!
ok, so briefly, i fancied playing with the innova for no other reason than cos its daft fun. tuning stuff for this sort of thing is ridiculously cheap, and i mean like 56 quid for a big bore kit including a new barrel, bored to 150cc including a piston, rings gudgeon pin and gaskets.
so, i got thee big bore kit, a brand new aftermarket cylinder head complete with 1.5mm bigger valves, a high lift camshaft, camchain, gaskets, (90 quid!!!!!) a new carb, 26mm instead of the stock 18mm (23 quid)big bore stainless exhaust with carbon can(35 quid) as i said, silly cheap stuff!
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so, this is just a quick upgrade, the idea being to have something cheap and fun to hang on the back of my old campervan, which tbh is a project in itself.
panels off and we have the venerable old innova lump,
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from here its just a case of bolting stuff off and new stuff on, the innova as stock kicks out a stonking 9bhp at the wheel, im estimating these improvements should give high teens with the advantage of losing ten kilos from the hugely weighty stock exhaust. so here we have the two pistons side by side showing not only the capacity hik, but the compression increase too judging by the sizes of the pistons valve cutouts. new camchain in at the same time.
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new head and valves, cant get bigger than these or else they would be clattering each other. cam has a lot more duration too, sham i didnt get pics of it.
once the head was on and times up, the new carb went on the old manifold and after a few mods, the original airbox. studying the multitude of supposedly tuned step thru hondas out there, mostly fitted with big exhausts and big carbs but nothing else inbetween, i decided not to go for thee silly air filter as it would cop all the water from the front wheel in the rain, which might restrict performance somewhat.
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and thats pretty much all there is to it, some funky new non pogo stick shockers on the back.
tin of satin black paint and a few screws and bolts to secure a motley selection of bargain panels and thats it really, at 150cc its hardly a thumper, but it sounds bloody lovely for a step thru and the satin black sleeper look apeals to me...
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completed, all told this rebuild has cost me about 200 quid and the mods arent yet completed, ive a little oil cooler kit to figure out how to plumb in next, but im gonna leave it till i can get it mot tested and insured so i can sort the jetting out right.
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and thats all the pics i have for now. im missing one small panel and im going to have to try and find some sort of aftermarket ignition because the stock unit has advance and retard controlled by a microswitch thats built into the carb itself, obviously the new carb is much bigger than the stock one but doesnt have the microswitch, but thats a problem for another day.
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OOO! Looks like fun John! ;) The lump hammer head next to the valves, could give the wrong impression! ;)
The advance and retard could be a bit of a conundrum and I look forward to your ingenuity at resolving that.
Thank you for posting.
Good health, Bill
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well its not a massive issue. these bikes are designed to be incredibly user friendly and civilised, so the stock carb as well as having the mocroswitch on it also has an electric heater element to prevent any risk of icing up when its cold, but in reality the thing wont be getting commuted so can do without that. plus, the microswitch is not a huge problem. most mechanically triggered ignition advanvce and retard units have the ignition set advanced for starting and then using mechanical weights retard it at higher speeds. but this engine is set to be fully retarded whenever the microswitch is closed by opening th throttle, in short the ignition has full retard all the time and gets advance by the throttle being shut and triggering the switch. so as it is, without the microswitch its got full retard all the time, which only makes it a bit lumpy at the bottom end when its cold. once its warmed up, it runs ok, and these bikes dont really get run round on closed throttles too much, theyre either off or flat out.
till i can get it on the road and givee it a thrashing about i wont know if its 100% but it sems ok for now, and the ignition advance and retard are negated somewhat by the fact that its also got a whopping carb compared to stock, so wont be running super lean as they are built by honda.
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Love this! It's easily got to be the cheapest and biggest power increase using brand new parts - 9 to high teens? Looking forward to the road test report... ;D
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just as an update to this, ive been messing with this on and off for a few weeks now. it took from june to august to get the v5 back, but its here now and the bike is now mot'd and taxed. ive been faffing with thee jetting till i got it close to right. took me several plug chops but its now as close as im going to get it, main jet is up from .95 to 115 and it now starts ticks over and revs cleanly. it pulls well through the gears and a blast up the local bypass shows that even with my lardy 20 stone sat on it, it pulls through to an indicated 75mph which isnt bad for a semi auto step thru commuter. im sure i coud get more from it, but i quite like that its stil rideable in traffic with the ability to trickle along at low speed without getting all wooly or overheating. so, as it is right now, its staying like this. i think a genuine 70+mph step thru isnt to be sniffed at. ive been told by the neds of the internet that their stock innovas did 75-85mph on the standard engine pipe and carb, which i find implausible for a 9bhp step thru, but its not a problem, if i ever meet them, im sure they can show me a clean pair of heels. me and the mrs are off to the lakes next weekend for a couple of days backlane fun so lets see how it copes for a couple of hundred miles, but for now, its bang on, and it still looks like a ratty old step thru.
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so ive been pottering round on this little thing for a few weeks, and this last weekend we decided to give it a bit of a run out, so saturday saw us run up the coast from silverdale to carlisle travelling on only b roads and unmarkd tracks, the full coastal route was 185 miles, and the little honda didnt miss a beat, sunday saw us put another 135 miles on up the scottish coast of galloway and then back to carlisle. today we ran back down the last 95 miles of the a6 to home. 415 miles under the wheels and not a beat missed. average fuel consumption was still about 110mpg on the honda in spite of its state of tune, though sues gs125 averaged 150mpg. theres a lot to be said for touring on small engined bikees. you see more and enjoy the journey more than something big and fast. i could have done the whole trip in a day on the bmw, butwheres the fun in that.
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Brilliant stuff John, loved reading about your weekender. Great stuff👍👍
Cheers, Michael
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Aye John,
Now that sounds a splendid wee run and the roads could have been on the quiet side. Your fuel consumption is twice as good as mine on the Mono SRX600 and the Bros400 that both return about 50 - 60mpg depending upon the amount of time above 50mph. Here's to you having many more good times out and away from the maddening crowd.
Good health, Bill