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mangosmoothie

Mango's mad project

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The Grom and z125 are 4-strokes and don't have that kind of power hit of the 2-stroke. The 65 probably has twice the power of a Grom. You should have rode up to Springfield with me yesterday to watch the mini road races. I am buddies with about half of the riders, a couple of them were on Groms, and one on a Z125. Adam crashed out of the main event or probably would have finished somewhere around 3rd:

 

https://www.facebook.com/CentralillinoisMiniMoto/posts/1960929304130016

 

22281741_1960929247463355_60513872652932

 

Young Delaney won the race and the season championship. She's only like 13 years old and can ride that bike! She also broke the track record yesterday:

 

22365150_1960929257463354_60826135011919

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oh yeah, I've ridden a grom. This motorbicycle pulls way harder once it's on the pipe, but idk if it's faster in a race scenario. takes a second to get into the powerband and the grom might be too far ahead by then.

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Actually you have to know how to ride a 2-stroke. You should always have it in the power band. If it's not you slip the clutch until it is. That's when racing of course.

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And the obligatory James Stewart on a 125:

 

 

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Motocross died for me when they switched over to 4-stroks.

 

 

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Ah, here's a perfect example. Watch this guy work the clutch in this front view.

 

 

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7 minutes ago, Road_Runner said:

I was thinking about racing against a Grom with my R1 but because they keep winning against that GSXR I chickend out.

You might have a chance since Mike blames it on the fact that he only has a 750.

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56 minutes ago, Road_Runner said:

I was thinking about racing against a Grom with my R1 but because they keep winning against that GSXR I chickend out.

BE.  VERY.  AFRAID!

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hard to keep it in the power band because it just wheelies in 1st and 2nd :) 

 

that is interesting though. I'll try to braze some supports on the frame and get a little rougher with it. I'm waiting for the tire to spin on the rim 

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You control wheelies with the clutch as well, just like you do with a 4-stroke when launching. When you master the clutch you should always be able to keep maximum power to the wheel while staying within the wheelie limit, which is true for both 2 and 4-stroke, but way more of an art on the 2-stroke because of the much narrower power band. It becomes easy and automatic with a little practice though. Basically you just keep the engine at it's full power (AKA WFO) and use your clutch like a throttle to meter that power as needed to the wheel.

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Never rode a later model 2-stroke sport/roadrace bike. Always thought it would be fun though. :) 

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On 10/9/2017 at 8:36 PM, Road_Runner said:

I was thinking about racing against a Grom with my R1 but because they keep winning against that GSXR I chickend out.

 

On 10/9/2017 at 9:34 PM, GSXR55 said:

BE.  VERY.  AFRAID!

Last time it was a 955 Triumph, 750 Suzuki, 1400 Kawasaki and a new 1290 KTM...

Sony beat us again <_<

 

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On 10/11/2017 at 11:22 AM, crash said:

Never rode a later model 2-stroke sport/roadrace bike. Always thought it would be fun though. :) 

 

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lowered the gearing on the rear so it's a bit more manageable. Power wheelies in 1st, but manageable. 

Trying to get a speedo hooked up to it.

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22815156_10209349069553108_3106120235504

 

22852091_10209349068953093_4260120542951

 

she seems to be running good. Ironed out most of the kinks. The stud supporting the radiator is jb welded to the tank and it's working great. But I could not get a jb welded stud to work for the exhaust pipe. Right now it's zip ties, but I'm going to try and braze an aluminum bolt on. 

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So the stud needs to go on the frame? My steel welds (TIG) are starting to look decent but I haven't tried Aluminum. We can if you want to bring it over. Technically it can even be two or three spot welds for the weight of that exhaust.

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Yeah. just trying to attach a bolt to the frame at a 90* angle. It doesn't need to be pretty so long as it holds. I'll try the alumaweld first because it looks easy. Does your tig welder have ac current? because from what I understand we need ac current to weld aluminum. 

 

 

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The pipe itself is steel right? Can you braze aluminum and steel together? 

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1 hour ago, mangosmoothie said:

Yeah. just trying to attach a bolt to the frame at a 90* angle. It doesn't need to be pretty so long as it holds. I'll try the alumaweld first because it looks easy. Does your tig welder have ac current? because from what I understand we need ac current to weld aluminum. 

 

 

Yes, it has AC and should weld aluminum. Now, if it's steel to aluminum, that's a different story, and yes, brazing is better in that situation because you are joining dissimilar metals.

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53 minutes ago, crash said:

The pipe itself is steel right? Can you braze aluminum and steel together? 

That's exactly what brazing is for if I understand the process well enough. There are specific 'brazing' filler rods that allow doing so but I've never done that.

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I'm brazing an aluminum bolt (what's going to serve as exhaust mounting stud) to the aluminum frame. Or if brazing doesn't work we can try to weld it. 

 

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EDIT: Disregard. I see now. Thought you were welding the bolt to the pipe, but you're welding it to the aluminum frame. Not dissimilar metals in that case. :)

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