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Post by fabster on Apr 23, 2024 9:14:42 GMT -5
Nice build, but whats up with those chopper handlebars? Are you planning to be a human air brake halfway down the strip?😂 I must admit it doesnt look so charming in the picture haha With the front fairing on, it is actually as low as it can be Also not personaly a fan of front facing stem, but it fits very well and handle beautifully even at high speed. I’m wondering, whats the weight on those full wheels? Would a spoked wheel not be lighter (and thus less mass to spin?) Love the topic so far, some nice stuff going on here! I need to come back with a more detailed answer to your reply, soon  Let just say this is Version 1  I made the thread to show the complete build, those pictures are from summer 2020 (4 years ago already  ). The Jog is now in V3 (and small changes are again coming for this summer). 2Fast 100cc exhaust and a good friend's Yamaha FS1 project. He swapped it with a kind of reliable 4 stroke, and converted it to fuel injection ! With also CBR125 fork and caliper and great rear suspension. So old school look and decent handling for what it is.   |
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Post by fabster on May 2, 2024 19:04:17 GMT -5
I then went to Secret Import to adjust it on their dyno.  We also tried the 2Fast torque converter, without any noticeable gain over the good old steel MHR from their Overange kit.   |
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myers
Scoot Junior
Posts: 14
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Post by myers on May 5, 2024 15:16:22 GMT -5
On what fuel are you running this? And what is your main jet size?  |
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Post by fabster on May 6, 2024 21:25:38 GMT -5
Up until this year, it's on pump gas, Premium 91 in America.
Main jet was 160 on 33mm Keihin. I really recommend going with a real carb (Keihin or real Dell'Orto).
No trouble and I find it much more consistent.
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Post by fabster on May 29, 2024 7:36:38 GMT -5
Back home, Version 1 is ready for the racetrack !   The red one is (was) for an air-cooled iron 70cc class we had back in the days. I've kept it until now. |
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Post by hypervertical on Jun 7, 2024 8:32:47 GMT -5
Do you know how much the scoot weighs and what the wheel base is? I'm building a 2fast minarelli on a 1987 jog frame and have been 3.9sec 0-60mph. I seen your 3.58sec 0-60mph pass on dragy and that's impressive, I'm hoping to see low 3second 0-60mph. My build is ran on q16 but it's not as much of a drag build as yours my wheel base is only 43in so launching is huge issue.
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Post by fabster on Jul 13, 2024 10:36:25 GMT -5
The first build (as on the last picture) is at 133.2lbs.
It went down to 108.7lbs after.
I should maybe continue to post updates
Wheelbase is 57" and is a huge help !
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Post by 90GTVert on Jul 14, 2024 15:09:12 GMT -5
The first build (as on the last picture) is at 133.2lbs. It went down to 108.7lbs after. I should maybe continue to post updates Wheelbase is 57" and is a huge help ! Wow. I think last time I weighed my Chinese scoot with an RC-1 it was 225 pounds or so, and I don't think that's with the roughly 10 pounds of tools that I carry or a full 2.5 gallon tank. Impressive. ...And def continue to update! |
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Post by fabster on Jul 16, 2024 9:26:38 GMT -5
The first build (as on the last picture) is at 133.2lbs. It went down to 108.7lbs after. I should maybe continue to post updates Wheelbase is 57" and is a huge help ! Wow. I think last time I weighed my Chinese scoot with an RC-1 it was 225 pounds or so, and I don't think that's with the roughly 10 pounds of tools that I carry or a full 2.5 gallon tank. Impressive. ...And def continue to update! This version is at 133.2lbs The year after we went a step further, I'll continue to post updates  This is the result of Version 1 :   Cellphone pic at night, at home with the other Jog  At Napierville Dragway   |
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Post by hypervertical on Jul 16, 2024 15:18:39 GMT -5
I ended up stretching mine to 47in, my scoot weighs right around 100lbs. I just switched to a pvl igntion and for the first time seen a 3.59 0-60mph and a 3.66 0-60mph, but it seems to be really picky on wanting a new belt to go faster then 3.7x's.
Also what rpm did your 2fast 100 minarelli run at? Mine seems to like 13,300-13,400, seems kind of low from what rpm I've seen other people run.
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Post by 808ministroke on Jul 16, 2024 20:56:48 GMT -5
What all did you do to get it down to that weight?
Did you put in the frame and reinforce them obviously the center line rooms are probably lighter anything else I'm missin?
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Post by hypervertical on Jul 20, 2024 5:04:10 GMT -5
I used a 1987 jog frame it's the lightest jog frame the only Yamaha frame lighter that I know of is the razz. I just ditched anything the engine didn't need to run and cut off all excess brackets and kept the 10in wheels and 2.75in wide front tire, used the OEM oil tank as a fuel tank because the OEM gas tank fuel nipple didn't exit high enough to feed my 38 airstriker. It's liquid cooled so no fan, shroud or stator cover,no headlight, tail light, turn signals ECT. I have a little clamp on light I put on the bars if I want to ride at night. Nothing special was done to mine to save weight I actually added weight, the center frame rails under the floor board have been extended 3in with chromoly tubing and it has the easy boost vertical to horizontal engine mount but I made part of the bracket out of aluminum and extended the bracket 2.5in.
There's not really much you can do to the frames to remove weight unless you want to make a chromoly/aluminum rear half or forks and steering stem. On my scoot using dragy I learned roughly 7lbs was equal to .1sec difference in 0-60mph ETA.
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Post by 90GTVert on Jul 20, 2024 6:57:09 GMT -5
On my scoot using dragy I learned roughly 7lbs was equal to .1sec difference in 0-60mph ETA. I wish that were a universal rule. In that case I could just get a 150lb rider on my scoot and go 4.76 0-60 if my math is correct. In a stripped Jog frame with lighter wheels it should go down to 3.33 with just a plain ole RC-1. I just searched to see what the rough rule is that some use for motorcycles. I thought I used to hear 0.1sec for 10lb in 1/4 mile. Too many rules out there. 5lb = 1HP, 10lb = 1HP and so on. Only one that makes much sense to me is power to weight calculation. This came up as the AI powered search result : "Heavier engines, like those on 1000cc motorcycles, can decrease a bike's acceleration and top speed. Lighter engines, like those on 300cc or 400cc motorcycles, can reach top speeds faster." My friend wants an S1000RR to replace his CBR600RR, but when we go out for a ride today I'm gonna tell him he'd be better off with a Ninja 300 and see how that goes. |
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Post by aeroxbud on Jul 20, 2024 15:12:30 GMT -5
On my scoot using dragy I learned roughly 7lbs was equal to .1sec difference in 0-60mph ETA. I wish that were a universal rule. In that case I could just get a 150lb rider on my scoot and go 4.76 0-60 if my math is correct. In a stripped Jog frame with lighter wheels it should go down to 3.33 with just a plain ole RC-1. I just searched to see what the rough rule is that some use for motorcycles. I thought I used to hear 0.1sec for 10lb in 1/4 mile. Too many rules out there. 5lb = 1HP, 10lb = 1HP and so on. Only one that makes much sense to me is power to weight calculation. This came up as the AI powered search result : "Heavier engines, like those on 1000cc motorcycles, can decrease a bike's acceleration and top speed. Lighter engines, like those on 300cc or 400cc motorcycles, can reach top speeds faster." My friend wants an S1000RR to replace his CBR600RR, but when we go out for a ride today I'm gonna tell him he'd be better off with a Ninja 300 and see how that goes. That's why the Suzuki GSXR 750 is still one of the best sports bikes. It's basically the same as a 600 in weight. But nearly 1000cc power. This is a fantastic build. Lovely attention to detail. 👍 |
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