Advise on restricting engine power please?

BusaBob said:
do you have a link for this site? I imagine it's done by limiting how much you can twist the throttle.
i know a couple people with the 125 Aprillia and they love it. i don't recall them saying that getting it street legal was an issue either.
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http://www.fiinternational.com/

Some RS125s came into Canada as street legal, while most did not. There was also a street legal kit. BC for example recently changed their laws banning post factory street street legal kits, so there is a couple shops out there looking to unload about 4 or 5 RS125s for $4k+ change because they are only useful as track bikes out there.

Ottawa has a couple legal RS125s selling for near $8k after tax. And the states is flooded with non-street legal ones.

The kit is an extra $1500 plus wiring loom installation so it adds up quite badly.

Also I looked at a couple used ones and discovered they have a problem with seizing due to the nature of a 2 stroke. I knew a guy out on a track day that seized it, and another who soft seized it. It happens when you get off the throttle and coast. Even a minor period of not supplying steady fuel can soft seize the engine.

So it is way too risky a purchase with all the headaches involved...not to mention servicing the piston seals all the time!
 
caboose483 said:
$2000/yr to insure a brand new rider on a ZX-10R?? I am skeptical.
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Listen, stop being smart ***. He is asking how, not if he should .... common throw him a line.

ps: Every time I thought I've seen it all, there comes another post .... filled my lunch break reading it LOL.

ps2: I am wondering, if I take a throttle cable from the litre bike will I boost power on my 250. I have to try it, so tempting.
 
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caboose483 said:
$2000/yr to insure a brand new rider on a ZX-10R?? I am skeptical.
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It's the quote I got from SF when I returned from abroad. I had to redo my entire M licence....well M2 anyways. They treated me as a new licence holder but considered my full G from way back in '96. I had no insurance history at all in Ontario as I had been gone longer than 7 years and they refused to go back further.

So I got $2000/yr on an M1, with a promise to have an M2 by the end of the week. SF views bikes as recreational vehicles and has very few parameters they base it on. Mainly age, year of full G, and capacity of engine.
She is the same as me in all regards, so that is what I am basing my assumption on. Rates however never get better, only worse!
 
THROTTLE STOP would be the easiest way to do it....make up a bracket and use a screw to limit the butter fly's from opening
 
BusaBob said:
thanks for the link. looks like i was right about the mechanical block on the throttle.
i see they even have a kit for 99-01 Hayabusa's. can't imagine one restricted to 33 hp though :P

didn't know that about the 125 Aprillias. it would suck to have one lock up.
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Yeah a stop looks like the way to go.

About the RS125....I can just imagine a learner rolling to a stop light shutting off the throttle and letting the engine scrub off some speed, then next thing....lurch lurch a soft seize! It requires too much mechanical and technical skill to ride that bike properly. Shame though....it was looking like a stunning first bike.
 
mxs said:
Listen, stop being smart ***. He is asking how, not if he should .... common throw him a line.

ps: Every time I thought I've seen it all, there comes another post .... filled my lunch break reading it LOL.

ps2: I am wondering, if I take a throttle cable from the litre bike will I boost power on my 250. I have to try it, so tempting.
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Do I know you? Are you my reincarnated bitchy wife from another life?
 
nothing wrong with limiting the HP of the 10R for learning asides from weight. Lots of people start on SV650s which have way more power and are heavier than the ZX10 ... I don't see anybody telling tales of whoa from that. Anyways a mechanical throttle lock is probably the best way to do it. Just look at a dyno graph see where it's make 30-40hp... and then mechanical stop the throttle from rolling farther than what will allow that many RPM. Also you might want to change the throttle tube to feel like there is more travel because a ZX10 will make 30hp way down low.
 
Freestyle72 said:
Lots of people start on SV650s which have way more power and are heavier than the ZX10
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come again??? you're joking, right?

an SV650S has way more power than a ZX10??? Are you sure???
 
reciprocity said:
how is this going to happen on a 2 stroke?
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My understanding, now I could be wrong, is that the 2 stroke engine requires almost a constrant throttle to supply the fuel / oil mix to the pistons. If you throttle off and coast or engine brake too long, the engine continues to run on momentum alone while oil is not being supplied to the pistons / chamber. This can cause a gradual over heating and soft seize a lot faster than one would suspect! This is not from personal experience but from what I have been told by a couple people who owned the RS125.

It often happens when riding up near 120kph, then coasting on engine braking through an off ramp for example. Running the bike near its max range at 120kph provides sufficient near over heating, when coupled with lack of lubrication feed, lead to the soft seize.
 
Freestyle72 said:
nothing wrong with limiting the HP of the 10R for learning asides from weight. Lots of people start on SV650s which have way more power and are heavier than the ZX10 ... I don't see anybody telling tales of whoa from that. Anyways a mechanical throttle lock is probably the best way to do it. Just look at a dyno graph see where it's make 30-40hp... and then mechanical stop the throttle from rolling farther than what will allow that many RPM. Also you might want to change the throttle tube to feel like there is more travel because a ZX10 will make 30hp way down low.
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I give you a +1
 
awyala said:
My understanding, now I could be wrong, is that the 2 stroke engine requires almost a constrant throttle to supply the fuel / oil mix to the pistons. If you throttle off and coast or engine brake too long, the engine continues to run on momentum alone while oil is not being supplied to the pistons / chamber. This can cause a gradual over heating and soft seize a lot faster than one would suspect! This is not from personal experience but from what I have been told by a couple people who owned the RS125.

It often happens when riding up near 120kph, then coasting on engine braking through an off ramp for example. Running the bike near its max range at 120kph provides sufficient near over heating, when coupled with lack of lubrication feed, lead to the soft seize.
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2-strokes provide essentially no engine braking.
 
awyala said:
But the pistons are being forced to move up and down right? Without an oil / fuel feed, coasting with the 2 stroke RS125 is a no no.
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I'm not talking about soft seizing.

You mentioned engine braking with a two stroke, there is no such thing as engine braking with a two stroke. An RS125 is a race bike, other street legal two strokes are a lot more user friendly and wont seize up as easily as you suggest.
 
caboose483 said:
I'm not talking about soft seizing.

You mentioned engine braking with a two stroke, there is no such thing as engine braking with a two stroke. An RS125 is a race bike, other street legal two strokes are a lot more user friendly and wont seize up as easily as you suggest.
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Understood, I missused the term engine braking. Essentially I meant, leaving it in gear and the bike riding on momentum. Unless I totally misunderstand how a 2 stroke works....the pistons would still be revving / cycling.

I'm not sure about soft seizing with other 2 strokes, but I have heard it happens at times with some older vespas, and it is a problem with the RS125, especially when people think they can ring it's neck on the highway or track.
 
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