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Old 05-22-2009, 12:41 PM   #1
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Default mod a Ninja .28 to a pullstart?

I'm in need of an engine for my SavageX,
and I've got a Ninja MR28 lying around..

Anyone done a GRP based .21 or .28 engine mod to a pullstart or rotostart?
I'm wondering if a Novarossi or RB backplate would fit the GRP/Ninja crankcase.

I've ever converted an RB C5 to a pullstart using Hobao parts so a mix-and-match of italian and taiwanese combo might work?

Inputs appreciated, thanks guys!
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Old 05-22-2009, 01:03 PM   #2
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It may be possible by using the backplate and OWB assembly from a STS 28 or 330....you would need to have the crankpin of the Ninja 28 drilled, and its possible you may need to have a adapter plate made up as well.
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Old 05-22-2009, 10:42 PM   #3
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Thanks for the reply Maximo,
Don't think I'll go that route as I do not have access to a precision drilling machine. And I prefer not to do work on the Ninja itself..
You know how some pullstart mechs have the part capture the crankshaft itself rather than a small pin poking into the drilled pin?
I'm looking for something like that..
Just not sure which brands have that kind of pullstart assembly.

Guess I'll just have to get a proper pullstart engine,
Maybe a Picco or LRP or Axial or RB..
Nothing too expensive, just wanna get my Savage running!
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Old 05-22-2009, 10:45 PM   #4
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Tiger drive?
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Old 05-23-2009, 01:13 AM   #5
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I choose rotostart above pullstart. No broken strings.
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Old 05-23-2009, 01:44 AM   #6
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i custom roto started an OS28
i put it in my LST
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Old 05-23-2009, 12:16 PM   #7
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Quote:
Originally Posted by casevac View Post
Tiger drive?
Not sure if i can retrofit Tiger Drive to the Ninja crankcase,
Will check out their website..
Thanks for the suggestion!

Quote:
Originally Posted by MrUnlimited View Post
I choose rotostart above pullstart. No broken strings.
It's not like I got a choice of rotostart or pullstart,
It's a matter of me being able to find a compatible backplate that fits the Ninja to make it roto/pullstart so that I can put it in my savage..

Quote:
Originally Posted by TIX View Post
i custom roto started an OS28
i put it in my LST
How did you do it?
Perhaps for OS engines it's much easier as they have the .30 roto/pullstart engine that you might be able to retrofit parts onto the 28XZ?
Did you have to do any work on the crankshaft?

Problem with the Ninjas/Falcon/GRP engines is that GRP has never made a roto/pullstart engine.
Nothing for me to work on, that's why I'm looking at other brands' roto/pullstart mechs that I might be able to fit onto my Ninja..
My closest bet would be the Novarossi or RB engines as Mario did work for NR before and that the dimensions of the NR/RB crankcase might be the same as the GRP ones..
But I can't take a gamble buying the NR/RB backplate hoping that it will fit my Ninja.

Does anyone know how the Novarossi roto/pullstart mech works?
Is there a small pin that goes into the drilled crankshaft pin or is the crankshaft captured by the mech itself?
(hope you guys understand what I'm talking about..)

Anyway thanks for your inputs guys!
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Old 05-23-2009, 05:22 PM   #8
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Quote:
Originally Posted by n.e.r.d View Post
Not sure if i can retrofit Tiger Drive to the Ninja crankcase,
Will check out their website..
Thanks for the suggestion!



It's not like I got a choice of rotostart or pullstart,
It's a matter of me being able to find a compatible backplate that fits the Ninja to make it roto/pullstart so that I can put it in my savage..



How did you do it?
Perhaps for OS engines it's much easier as they have the .30 roto/pullstart engine that you might be able to retrofit parts onto the 28XZ?
Did you have to do any work on the crankshaft?

Problem with the Ninjas/Falcon/GRP engines is that GRP has never made a roto/pullstart engine.
Nothing for me to work on, that's why I'm looking at other brands' roto/pullstart mechs that I might be able to fit onto my Ninja..
My closest bet would be the Novarossi or RB engines as Mario did work for NR before and that the dimensions of the NR/RB crankcase might be the same as the GRP ones..
But I can't take a gamble buying the NR/RB backplate hoping that it will fit my Ninja.

Does anyone know how the Novarossi roto/pullstart mech works?
Is there a small pin that goes into the drilled crankshaft pin or is the crankshaft captured by the mech itself?
(hope you guys understand what I'm talking about..)

Anyway thanks for your inputs guys!
My way is about your only way...unfortunately no matter what the crank must be drilled, there is no way around it whether you like it or not....The STS OWB assembly has the same stroke and has worked well in Picco .21's I have converted....
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Old 05-24-2009, 10:01 PM   #9
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Quote:
Originally Posted by Maximo View Post
My way is about your only way...unfortunately no matter what the crank must be drilled, there is no way around it whether you like it or not....The STS OWB assembly has the same stroke and has worked well in Picco .21's I have converted....
Don't think I'd wanna drill the crank pin. Not worth risking my Ninja for a monster truck that I'm gonna bash with.
Guess the only way is to buy an affordable pullstart motor for my Savage..
Any recommendations?
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Old 05-25-2009, 07:34 AM   #10
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Quote:
Originally Posted by n.e.r.d View Post
Don't think I'd wanna drill the crank pin. Not worth risking my Ninja for a monster truck that I'm gonna bash with.
Guess the only way is to buy an affordable pullstart motor for my Savage..
Any recommendations?
Picco 28 as first choice, LRP 30 as second choice...
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