Vader 150

TominMO · 03-23-2024, 06:50 PM

Just replace the front sprocket and ride it around for a while. You may decide that is the best overall gearing. If you also replace the rear with a smaller one, You may discover that now it has no pull from a dead start--i.e. it is over-geared.

That is a poor exhaust design that makes you loosen the exhaust bolts just to change the oil. (You don't actually have to remove the exhaust to change oil.) If you go with an aftermarket full exhaust, maybe it won't be in the way of the drain plug.

ProDigit · 03-23-2024, 10:25 PM

I've done the same in the past with a roketa bike.
Basically, I will want to achieve top speed in 4th (4th gear equal 5th stock); and in 5th gear I just want to cruise at lower speeds, and lower rpm.

My roketa used to occasionally have a slipping clutch (wet clutch) with the high gear ratio at wot in final gear.
I'm not going to do that on this bike.

The engine won't know the difference between 4th and stock 5th, as the overall gear ratio is the same.
From online, the 150 should do about 65-70mph tops. That is in 5th gear stock rear sprocket, or 4th gear modded.
I plan on mainly cruising at 35-55mph in 5th gear, so it's not really lugging the engine. Engine gets lugged more in stock 4th or 5th gear during acceleration, than modded in 5th for cruising.

The 125 I had before ran really wonderfully at 2.5k rpm at 40mph. I doubt I can gear the 150 that low; but will if I can.

My pet peeve with the roketa 125 (probably same engine and transmission specs as a gen 1 Vader 125), is that at those sprocket ratios, you really need an extra gear. And the 125 wasn't accelerating fast enough to keep up with traffic, unless I'd rev it all the way to 5k rpm..

I'm fairly sure this 150cc can handle it, especially with the extra (5th) gear.

03-23-2024, 06:50 PM	#1
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,889	Just replace the front sprocket and ride it around for a while. You may decide that is the best overall gearing. If you also replace the rear with a smaller one, You may discover that now it has no pull from a dead start--i.e. it is over-geared. That is a poor exhaust design that makes you loosen the exhaust bolts just to change the oil. (You don't actually have to remove the exhaust to change oil.) If you go with an aftermarket full exhaust, maybe it won't be in the way of the drain plug. __________________ 2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself
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03-23-2024, 10:25 PM	#2
ProDigit Join Date: Aug 2013 Posts: 169	I've done the same in the past with a roketa bike. Basically, I will want to achieve top speed in 4th (4th gear equal 5th stock); and in 5th gear I just want to cruise at lower speeds, and lower rpm. My roketa used to occasionally have a slipping clutch (wet clutch) with the high gear ratio at wot in final gear. I'm not going to do that on this bike. The engine won't know the difference between 4th and stock 5th, as the overall gear ratio is the same. From online, the 150 should do about 65-70mph tops. That is in 5th gear stock rear sprocket, or 4th gear modded. I plan on mainly cruising at 35-55mph in 5th gear, so it's not really lugging the engine. Engine gets lugged more in stock 4th or 5th gear during acceleration, than modded in 5th for cruising. The 125 I had before ran really wonderfully at 2.5k rpm at 40mph. I doubt I can gear the 150 that low; but will if I can. My pet peeve with the roketa 125 (probably same engine and transmission specs as a gen 1 Vader 125), is that at those sprocket ratios, you really need an extra gear. And the 125 wasn't accelerating fast enough to keep up with traffic, unless I'd rev it all the way to 5k rpm.. I'm fairly sure this 150cc can handle it, especially with the extra (5th) gear.
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