XTM 24.7 in Kyosho Inferno MP7.5 Sport II?

[Subie]

Hey all i'm fixing up my old Kyosho Inferno and the stock GX21 engine is toast. Was wondering if i can swap it out for a XTM 24.7. Any help is appreciated i don't know much about rc and haven't ran this baby for atleast 6 years!http://s1058.photobucket.com/user/brotherAli1/media/image19.jpeg.html?filters[user]=128709151&filters[recent]=1&sort=1&o=0

 

[mrbones]

Well, looks to me that you Kyosho mounting is built into the engine and very far forward towards the clutch bell. The XTM motor mount (which you will have to come up with) is located towards the back of the engine so you will probably have to drill the frame to fit the XTM mount. And you will have to drill it so you can move it around a little to be able to adjust you gear mesh.

 

[Subie]

Well, looks to me that you Kyosho mounting is built into the engine and very far forward towards the clutch bell. The XTM motor mount (which you will have to come up with) is located towards the back of the engine so you will probably have to drill the frame to fit the XTM mount. And you will have to drill it so you can move it around a little to be able to adjust you gear mesh.

Sounds do-able to me, are there any motors that could be a direct swap?

 

[Nitrotrout]

Wow, that is a funky engine mount design for sure. I looked up some images of your engine and chassis on ebay
http://www.ebay.com/itm/Vintage-Kyo...Control_Parts_Accessories&hash=item258ac6584d
http://www.ebay.com/itm/Kyosho-Infe...Control_Parts_Accessories&hash=item4ad08dce1d

 

[mrbones]

I think that Kyosho is the only one that makes that type of mount. And you also need take a look at the motor shafts because both are different and your Kyosho clutch bell is not going to fit the XTM shaft.

 

[Snook Man]

I’m pretty sure all the Kyosho Inferno series use a standard engine mount? and just about any BB engine can be installed with little alteration.
Have a look at the mount setup, if its bolted to the engine you should be able to fit most anything. If not you should be able to fit almost anything with a few mods.

 

[Nitrotrout]

If you look closely at this pic, you'll see what appears to be an engine mount outline on the two plates. If it's a factory offered accessory, hopefully you can add whatever engine you want with little or no modification. The four oddball screw holes in the center are for the GX21 engine.

http://www.ebay.com/itm/Kyosho-MP77...Control_Parts_Accessories&hash=item566276668b
http://www.ebay.com/itm/CNC-Engine-...Control_Parts_Accessories&hash=item519c592ebb
http://www.ebay.com/itm/Engine-Moun...Control_Parts_Accessories&hash=item2eb74e7ba4

 

[Subie]

So basically i just need to drill 8 holes for the mount? From it being pushed back, isn't the spur gear not going to line up anymore?

 

[Nitrotrout]

I don't think you need to drill anything, theres a whole lot of holes there already.
Try one of these motor mounts, they should bolt in directly.
http://rover.ebay.com/rover/1/711-5...Control_Parts_Accessories&hash=item566276668b
http://rover.ebay.com/rover/1/711-5...Control_Parts_Accessories&hash=item519c592ebb
http://rover.ebay.com/rover/1/711-5...Control_Parts_Accessories&hash=item2eb74e7ba4

 

[Subie]

Would i be able to align the mesh correctly since the engine is being moved back a little?

 

[Snook Man]

If you're chassis has the same hole pattern as the pic in post # 7 it is capable of using a standard engine mount with just about any BB engine and the GX.21 with the mount built into the crankcase.
The forward and narrow holes are for the GX.21/built in mounts (the built in mounts are more forwad on the engine crankcase), the rearward wider set holes are for a standard engine mount, the shims you see in the pic keep the bottom of the engine from hitting the chassis, depending on which mount you use you may or may not need the shims.
I didn’t have the Sport version but my chassis was like the one in the pic and I could mount just about any engine without issues with spur/clutch bell mesh.

 

[Nitrotrout]

Its not the engine being moved back, just the engine mounts. That GX21 engine is the only engine I've ever seen with a mount located under the front engine bearings.
This is a much more common engine / engine mount design.

 

[Subie]

Thanks guys ill be picking up my XTM 247 this week and ordering a XTM Sliding clutch and motor mounts http://www.amazon.com/GPM-Racing-MP...8&qid=1394521926&sr=8-1&keywords=mp7.5+kyosho i chose to go with these mounts.

 

[mrbones]

Hobby People has that engine for $100.

 

[Subie]

Yeah I'm ordering the motor from Hobby people. So heres my list of parts going to order.
-http://www.ebay.com/itm/XTM-149596-1-8-Sliding-Clutch-Kit-XTM-Factory-Sealed-/111288157781
-http://www.amazon.com/exec/obidos/ASIN/B00C7Q5VZ4/ref=nosim/rcnitrotalkkc-20
-http://www.horizonhobby.com/products/645mg-ultra-torque-servo-HRC32645S?utm_medium=Product_Search&utm_campaign=CA_Product_Search&utm_source=HRC32645S&CAWELAID=320011980000034167&cagpspn=pla&gclid=CJe7osXwir0CFQpcfgod_CEA3w

Some pics of the buggy
s1058.photobucket.com/user/brotherAli1/media/photo4.jpg.html?filters[user]=128709151&filters[recent]=1&sort=1&o=1

s1058.photobucket.com/user/brotherAli1/media/photo4.jpg.html?filters[user]=128709151&filters[recent]=1&sort=1&o=1

 

[mrbones]

Next time to need a hi torque servo, try one of these. It's a digital coreless with 180oz, metal gears for $15. From Hobbypartz. They have good prices on battery packs for your car too. And if you spend $50, shipping is free.

http://www.hobbypartz.com/60gexidise.html