Looks good and glad someone did the right thing before resisting the urge attempting to ride right from the box.............Lots of fun and good rides on them.................:thumbsup:
CAGs Toys and fun
Well a couple weeks back a few buddies bought Giovanni bikes on ebay and showed me the pics of their fun during a nice evening campfire- promptly I cruised into the house and hit buy now times two... GF gets one too haha.
I found another on Kijiji and brought it home in the meantime. It's not a bad little bike, but had to do the standard fixes. Brakes adjust, chain tension, clutch and drum clean/resurface, carb cleanout etc etc.
Handy tip- being an ex-mechanic of ten years I have tooling and leftover goodies- of which I found that the brake caliper pin lube works fantastic in the throttle grip where the cable just wraps around the plastic radius.
So last night my two Giovanni bikes arrive and I found that I had to go over just about everything I wouldn't want to be a kid riding one of these straight out of the box- geesh.
Started with my black one and fixed the major brake adjustment issues, loctite'd everything, aligned the chain, lubed the throttle cable, castrol chain lube on the chain etc etc. Ran it through 6 thermal cycles using my IR camera to monitor (I'll post up the pics later) FYI the emissivity of the cylinder and reflected apparent temp mess with measurements using a spot type IR thermometer. Not that this is overly critical anyhow.
This bike seems to get stronger and snappier with every cycle- The difference is quite pronounced and I haven't even rode it yet. I'll do a few more then ride a couple tanks and swap the plug for a good NGK.
Did the GF's red one next. Same drill but didn't have time to get it running. Took a bit more work with chain alignment and lube to get this one freed up and smooth. Should be a good toy soon...
Thanks to all who post in the forum, I got alot of useful tips for sure. And more to come I'd bet. Here's a couple pics.
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Cheers
Eric
I found another on Kijiji and brought it home in the meantime. It's not a bad little bike, but had to do the standard fixes. Brakes adjust, chain tension, clutch and drum clean/resurface, carb cleanout etc etc.
Handy tip- being an ex-mechanic of ten years I have tooling and leftover goodies- of which I found that the brake caliper pin lube works fantastic in the throttle grip where the cable just wraps around the plastic radius.
So last night my two Giovanni bikes arrive and I found that I had to go over just about everything I wouldn't want to be a kid riding one of these straight out of the box- geesh.
Started with my black one and fixed the major brake adjustment issues, loctite'd everything, aligned the chain, lubed the throttle cable, castrol chain lube on the chain etc etc. Ran it through 6 thermal cycles using my IR camera to monitor (I'll post up the pics later) FYI the emissivity of the cylinder and reflected apparent temp mess with measurements using a spot type IR thermometer. Not that this is overly critical anyhow.
This bike seems to get stronger and snappier with every cycle- The difference is quite pronounced and I haven't even rode it yet. I'll do a few more then ride a couple tanks and swap the plug for a good NGK.
Did the GF's red one next. Same drill but didn't have time to get it running. Took a bit more work with chain alignment and lube to get this one freed up and smooth. Should be a good toy soon...
Thanks to all who post in the forum, I got alot of useful tips for sure. And more to come I'd bet. Here's a couple pics.
Cheers
Eric
4
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Haha perfect! I was thinking the same- I couldn't decide wether to mess with porting etc right away, or break it in first then do some cutting. I chose the same way you mention. Made sense to me as well. Plus I'd then have a baseline to judge from.
I have a cheap tach on its way- along with a big bore complete engine for the yellow one. It needed a few things anyhow and thought what the heck- might as well give it a try.
Here some of the pics of the heat cycling- I didn't get a chance to optimize them for span etc- so they aren't the best.
Thanks for you help and kind words! Cheers
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I have a cheap tach on its way- along with a big bore complete engine for the yellow one. It needed a few things anyhow and thought what the heck- might as well give it a try.
Here some of the pics of the heat cycling- I didn't get a chance to optimize them for span etc- so they aren't the best.
Thanks for you help and kind words! Cheers
4
Thanks. Heat cycled the red one tonight, but I fear it will not last long. This thing is nowhere like the black one. Motor has a very pronounced clanginess which sounds like skirt smashing the cyl. Took the externals off to investigate but its definitely internal as you can note it over TDC. Oh well- not much I can do but run it for now. Less pronounced when it warms up so I'm not too worried.
Learned a few things
-don't run them dry as something will lodge between the needle and seat causing a mess. Doh.
- When on a tilt the float does bind up on the bowl (I assume) running them dry, leaning out and quitting... should have smoothed out the bowls before running at all. Noted...
- Pegs fixed up with JB weld for now as I know the would have lasted about 5 seconds. Thanks to other friends who wrecked a good ride due to this, saving me the grief.
Anyhow- on track for some riding now.
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Learned a few things
-don't run them dry as something will lodge between the needle and seat causing a mess. Doh.
- When on a tilt the float does bind up on the bowl (I assume) running them dry, leaning out and quitting... should have smoothed out the bowls before running at all. Noted...
- Pegs fixed up with JB weld for now as I know the would have lasted about 5 seconds. Thanks to other friends who wrecked a good ride due to this, saving me the grief.
Anyhow- on track for some riding now.
4
Sounds good for sure. I thought I'd give them a chance before throwing them in the trash. Here's the ridiculous ones I put on the used CAG. They need to be trimmed yet, but solid enough LOL. Such a poor fix I'm embarrassed, but very functional for now. They are crazy solid considering the contact area...
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Cheers
Eric
Cheers
Eric
I weld on BMX stuntpegs..First I drill and tap them,,nut them and weld them for extra security....If they become a problem theyre easily trimmable.......
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Some pics of a low budget big bang for your buck syock modified 49cc thats gonna spin atleast 13,000rpm's with a stock crank.........
When you pop those Gio bike cylinders theyll look like this one but without the boost port I grinded in....
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Some pics of a low budget big bang for your buck syock modified 49cc thats gonna spin atleast 13,000rpm's with a stock crank.........
When you pop those Gio bike cylinders theyll look like this one but without the boost port I grinded in....
4
Nice Bud! 
I finally made it through your whole thread and in hindsight I really should have copy and pasted the tips into a txt file or something. I see you do a few like above- sleeper stocker versions.
Any tips on Boost port height/width? I see some exhaust work, but anything done to the piston? I saw a bit about this but the details of which I missed.
Thanks for sharing the great ideas! I'd love to bump up the stockers and see how much I can squeeze out of them once they have a few miles on em.
Cheers
Eric
I finally made it through your whole thread and in hindsight I really should have copy and pasted the tips into a txt file or something. I see you do a few like above- sleeper stocker versions.
Any tips on Boost port height/width? I see some exhaust work, but anything done to the piston? I saw a bit about this but the details of which I missed.
Thanks for sharing the great ideas! I'd love to bump up the stockers and see how much I can squeeze out of them once they have a few miles on em.
Cheers
Eric
I do enhance engines no-one will do and I do like making sleeper engines...Everyone mostly makes judgement on things based on how it looks...I love it when someone shows up on a flashier looking bike and everyone thinks its faster,,,until it gets beat then my comment is atleast their bike still looks pretty............LOL...Nice Bud!
I finally made it through your whole thread and in hindsight I really should have copy and pasted the tips into a txt file or something. I see you do a few like above- sleeper stocker versions.
Any tips on Boost port height/width? I see some exhaust work, but anything done to the piston? I saw a bit about this but the details of which I missed.
Thanks for sharing the great ideas! I'd love to bump up the stockers and see how much I can squeeze out of them once they have a few miles on em.
Cheers
Eric
A 43cc engine will have some good comparable power to a 49cc power with serious revs...For some reason the thicker 40mm cylinder holds its shape better and deforms less when thermally expanded....This is an old mildly modded 43cc piston
The piston is indeed modded...Its lightened 2.7 grams,,It has 4 ports facing the stock windows thats 7/64" and a 5th port facing the 3rd boost port I cut into the cylinder..then I raised the sideskirt profile a lil bit,,deburred the piston edges,,thinned the Wiseco rings a tad,,polished the ringtops and the piston sides,,polished the top too but left the piston top pebble finished this time for the differing results on this engine............
3
For your exhaust port youre gonna notice the inner part of the cylinder port side its gonna be rectangular shaped..You want it to look more rounded on the top with widened and rounded exhaust port sides while keeping the bottom untouched and flat.....
Out towards the exhaust flange youll notice the flange opening looks like the letter D,,,,,I give it more of a rounded square shape thats matched to my exhaust flange opening size...............
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Out towards the exhaust flange youll notice the flange opening looks like the letter D,,,,,I give it more of a rounded square shape thats matched to my exhaust flange opening size...............
3
Very cool. I'm sure I'll figure it out when the time comes. A few grey areas
Help me out- which way do you put the carb float- ridged side up or down? I've now found them both ways. I would expect the ridge goes up against the forks. The cleaning threads seem to miss this.
Had to take the carb off the black one and clean it- something was causing the needle to be stuck open and make a mess. Definitely was a bit of debris in the bottom of the bowl.
Shouldn't be piddling all over the floor when I'm done...
Cheers
Help me out- which way do you put the carb float- ridged side up or down? I've now found them both ways. I would expect the ridge goes up against the forks. The cleaning threads seem to miss this.
Had to take the carb off the black one and clean it- something was causing the needle to be stuck open and make a mess. Definitely was a bit of debris in the bottom of the bowl.
Shouldn't be piddling all over the floor when I'm done...
Cheers
The ridge goes down..The ridge should mate with the bottom of the bowl at full drop.Some carbs have rounded float bowls and some have squared off float bowls....Ive sanded and polished the mainjet carb casting tube to get a smoother up n down float action and I still got puddles on the floor from time to time..wanna stop the mess in the floatbowl get ethanol stabilizer or two stroke oil that has it mixed with-in like Stihl HP Ultra Synthetic 2 stroker oil,,,Very cool. I'm sure I'll figure it out when the time comes. A few grey areas
Help me out- which way do you put the carb float- ridged side up or down? I've now found them both ways. I would expect the ridge goes up against the forks. The cleaning threads seem to miss this.
Had to take the carb off the black one and clean it- something was causing the needle to be stuck open and make a mess. Definitely was a bit of debris in the bottom of the bowl.
Shouldn't be piddling all over the floor when I'm done...
Cheers
Ever since switching over to hp pumper carbs did I have ever so much fun on my cags.....If my cags still had floater carbs theyd be in the shed rusting away............. the X1s,,twin engined mini harley and stand-up scooters would be the most frequently used bikes again......
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