I was just wondering if there is any benefits without a pull start on a fantom fr15.I read somewhere that without one your engine will reach slightly higher rpm's and accelerate faster because of less rotating mass?Is this true or is someone blowing smoke up my arse and if it is true do they sell something to convert to a non-pullstart?I saw that fantom uses boost chambers on the non-pullstart versions.Do they sell something to run that setup?

in any engine the less mass of the moving parts the better acceleration and higer RPMs.

the pull start has an extra bearing, and a extra shaft tied to the crank so yes, the pull start will effect performance a bit.

if you are racing then every bit of power is needed but if you are not then you probably wont notice the diffrence.

also the reason they have the boost bottle on the non pull start is again... every bit helps when racing and they probably figure that if you use teh PS version then you probably arent racing so dont need that extra bit of power.

ditto unstable

today i just put the back plate on my Hyper .21 to get rid of the pull start for a few reasons.
one like you said less moving parts = higher speeds.
two pull starts break over time.
three my arms get tired of yanking on that cord on those days when it wont fire up.

the back plate was $10 and i ordered the starter box, which will be like $100(give or take) and will work with my 1/8th buggy and 1/10th on-road.

I wish I could use a box with my savage.Maybe they will come out with an adapter so I can use there new electric start on my hyper21 8 port.I just got my fantom broke in and I'm starting to not like pullstarts any more so thats why I was wondering if I could change it to a non-pullstart without spending allot more on the engine.

converting a pull-start to non-ps isn't hard or expensive. Just be careful when you cut the little knob off the crank, and be sure to seal up that backplate when you put it on (a LITTLE O2 sensor safe silicon gasket maker and threadlock on the bolts).

As far as buying engines, I've never seen one where the non-pullstart version was MORE expensive, its usually the other way around.

hey rex, they sell an electric starter for the savage. http://www2.towerhobbies.com/cgi-bin...?&I=LXERF2&P=7 you will also need a rechargable battery. http://www.hpiracing.com/kits/savage21/savage21-m.htm , thats the hpi site, the first section shows the pic of the roto start.

GeorgeKelp:...I know they do but I says it only works on the 21bb and the force .21 and .25. Is the pullstart on the Force engines the same as on the Hyper 21 8 port?If so I will definately get the roto start.I hate tugging on these .21 engines it killer on the hands.

Whiskyvr4....I wasn't thinking when I bought the pullstart version of my engine.I should've bought the non-pullstart version and just got a box but it's to late now i already broke in the engine so they won't take it back.I just wanted to know if it was possible to change it for as little money as possible but it looks like I'll just keep it this way and when the engine dies i'll buy one without a PS.Thanks for all the info Guys it's been a big help.

I have to chuckle every time I read a post that talks about pull starters. I'm the only person who has a starter box in the bunch of guys I hang with and here's what I see. If their cars don't start after the first few pulls, they throw them on my box. I don't mind the guys using my box at all, it's just funny when someone claims they actually like their pull start. I see what's actually preferred when the two methods are both available.

what little knob?

when i took off the pull start plate i didnt see any little knob.

I bring a starter box with me every time I run, although my SS is pull start. I've found that I never use the starter box, even when its sitting right next to the car. No need, really. A well-tuned engine should fire easily with a pull start. The only real benefit is that its easier to get the car started using a starter box when you already have the body on the car.

a pull-start crankshaft typically has a little extension on the end of it that fits into the shaft on the backplate. That shaft then has the one-way bearing and the pull starter mechanism attached to it (on the outside of the backplate). I don't know about every engine, but on the ones I've seen converted, the little extension had to be cut off for the non-pullstart backplate to fit on.

ah i see

mine has a little shaft connected to the pull start assembly so when i pull it off the only thing i see inside the bloc is the piston connected to the crank.
then the back plate slides right in

In order to bolt on an engine backing plate, the crank pin needs to be flush with the connecting rod (no part can stick out past it).

Even well tuned engines can go through a finicky spurt now an then. In this case the starter box will start it anyway. You may wear out the pull start on one one of these occasions.

i just put the hot bodies jump start (roto start ) on my ofna ultra mbx pro with force 25 and i love it it is great i would recommend it to anyone and to answer your earlier question yes it will work on the picco engine but you should verify that with your lhs

Is the force .25 pullstart the same as the HYper21 8port?If it is than that would be sweet.NO MORE PULLSTARTS