Yamaha YSR 50 RD 125 motor

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New carbs tuned close to proper. Only work done to motor is nothing. Motor is stock. Changed stock 18mm Teikei round slide carbs to 24mm Mikuni flat slide carbs, added the connector tube (boost bottle tube) to connect the two intakes with new rubber boots
(Calamari racing for carbs, boots, K&N air cleaners). Changed the stock reed block to the YSR50 reed block(bigger volume capacity and also bumps lower crankcase compression a touch) and added boysend reeds. One off expansions welded to stock but shortened headers. 2nd gear is good to at least 40mph.

Опубликовано:

14 окт 2024

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Комментарии : 20

@joesfreshaquatics6488 5 месяцев назад

Bro this is my build you sir are a genius

@wsmaga 8 месяцев назад

This bike sounds so sweet.

@johnmorton5435 11 лет назад

got to do some test riding on a 1/2 mile private road. 1st gear 15/20 mph 2ng gear 40/45 mph 3rd gear 70mph 4th gear seen 95/100mph and had more rpm to go and never seen 5th gear. that old 76 RD125 motor is perfect for this bike. didn't want to go over 100 without the steering stabilizer. i think i want to change the gearing a bit to get some more giddie up out of it

@murrayminimotors1674 20 дней назад

Sweeeet build

@johnmorton5435 11 лет назад

Yes Very Very soon hopefully. Minimoto came thru right when I was about to give up. We'll see how shipping goes.

@johnmorton5435 11 лет назад

Minimoto finally came thru ....I hope, we'll see how long it takes for them to show up. but paid and hopefully soon to be on the way

@johnmorton5435 11 лет назад

as far as plastics go....... doing something real soon(next couple days). tired or waiting on others. need to change from 6 volt lights to 12 volt lights and have been avoiding cutting up the stock plastics to do so. I got 2 frames same vin ...one stock one RD. be nice to keep the stock plastics for the stock and second set for the RD one. I just may put a motard light and front fender on it and run it as a naked YSR. Dunno but its ready to register if I get lights on it

@MrPuch78 11 лет назад

Are you ever putting the fairings back on it? Nice job with the conversion!

@carlosdavidgalarza9338 6 лет назад

Hey man, thats a really nice setup, did you have to change new motor mounts?, do you think rd350 engine fits?

@johnmorton5435 4 года назад

I've seen an rz350 in one but you need a lot of frame work and welding to make it happen. You can do anything with unlimited wallet. But honestly that'd be too much to be road worthy

@johnmorton5435 11 лет назад

all intents and purposes.... yes. I live in kings beach but yes. this video was done just to the right of the caliente restaurant in the little green cottages. if you happen to hear a crazy ass sounding ysr on the roads of truckee, it's me

@joski9030 5 лет назад

Bet the neighbour’s love you bro lol How fucked is the dude at the end 😂

@FallenRipper94 10 лет назад

DUDE thats fucken BADD ASS

@johnmorton5435 10 лет назад

Check out the latest video..... Yamaha ysrd 125. all new plastics and paint done. heading to dmv now

@johnmorton5435 10 лет назад

and thanks you very much

@cheeesefunnel 10 лет назад

what is the 1/4 mile time ?(ballpark figure) and top speed? ..I wanna make one

@johnmorton5435 10 лет назад

no idea actual times and figures yet... will dyno when done. been doing a lot of work on it and close to registration. from test rides....ballpark guess ......10 to 12 seconds...closer to 10. hitting 90/100 mph by speedo at 3rd 4th gear shift point at about 10 seconds....... cant tell u actual distance on that but its quick and this tranny keeps getting taller as it goes.... safe to assume 4th n 5th are same deal but aint had room to test and the Dunlop tires are in question over 100/110 ..... tires are an issue at 12 inch with that motor. feasibly this motor current setup could do 150mph .... the Dunlops will shred and at that speed and ysr fork diameter and folding the front end from rolling resistance becomes an issue. been trying to find the fastest rated 12 inch tire..... think its Michelin rated to 112 tested to 180. I'd be safe at 120 with that. go to 14 inch rims and u can get rated to 170mph which should be safe at any speed with that motor........again tho...... I'd be concerned... very concerned with the ysr front forks over 110 mph...... the new Honda grom inverted front forks look like a GREAT option. newly released for 2014..... pretty sure exact same size head set but have not got my hands on one yet...... would solve all ysr fork issues with that installed

@GyroPyro121212 5 лет назад

John Morton What sort of work if any is done to the RD125 engine. Assuming a bike/rider combo weight of approximately 350 lbs, it would take about 37 hp to do a 12.9 seconds 1/4 mile. With the stock 17 hp RD125 engine, the 1/4 mile would take about 16.7 seconds. These are all based on calculations of course.