Rw modding and engine rebuilding
 

I have rebuilt quite a few motors for guys on the board here. I have slowly been modding motors too, mostly for myself and experimenting. I am confident now that I am ready to do it more for other racers.

As far as rebuilding a motor I take the motor apart and check it over, especially the rod and crank pin wear. I pull out the front bearing and pull the carb off and clean the block in a high pressure washer. If the front bearing is still good I clean and regrease or oil. On most motors I see they need a pinch, I have found a very effective method that works very well and keeps it very round. I have not found a size yet I couldn't pinch. I have even made plugs to fix a sleeve someone has tried to pinch themselves.
I use Tko bearings and I have had very good luck with using Go parts in Novarossi based engines. Especially the Go rod, it is very strong and is only $18.69.

If you have any questions you can post it on here or Pm me.

Rex

Did you mod any of the motors Kendall is currently running?

Modding motors isn't as simple as taking a dremel tool to the internals....

What issues for a particular motor are you trying to fix? How do you know the "fixes" you are making are actually improving the performance? How much R&D did you do on a particular engine?

With regard to "pinching".... Do you maintain the sleeves taper?

When I started my Nitro Engine Modding and Service, I took a V-Spec to work where we "modeled" it on a super computer, worked with Fluid Dynamic Engineers to see how and where to make changes if necessary. After that I mod'ed the motor and gave it to a sponsored driver to test. We continued to make changes. I must have gone through half a dozen motors, till we got it where we wanted it...

And with sleeve equipment, we went with IMO is the best DIY pinch equipment from Rayaracing.com. Sure there was an initial cost in buying the equipment, but we've had excellent success with it...

I'm not dissing you, maybe just giving you something to compare your services to. I do wish you the best of luck!

Code name: Starfish

http://i155.photobucket.com/albums/s...ndrc/CRANK.jpg

LOL!

I don't do too much to Kendalls motors. He ran them stock a couple race weekends then I just did some blending and polishing to the crank.

Rex

Bushyar15, I have rebuilt several different modders motors and was not impressed with 1/2 of them. Like Maximo has said, not very many modders change timing. I personally just do more blending and cleanup and don't mess with timing much, you can make a engine hard to tune. I also think a crank like someone pictured above maybe could make more power, but at the expense of making it hard to tune. Being a machinist I have put bypass ports in motors that don't come with them. I really like how some modded motors have many hours in them and the modder didn't even think to touch the block.
The machine I use to pinch is over $10,000 new, but pinching is not what it was made for. I have had several customers say they like mine better than others they have used. I don't pinch my motors very tight, I keep them so round they only need a coule tanks through them to go racing again. I had a customer get over 8 gallons on a motor after I pinched it.

As for what I'm trying to fix, each motor is different. The v-spec is a good example, Os changed the sleeve on the speed slightly, I've had customers update there regular v-spec to a speed crank and rod. I update the sleeve if they want me too, it really smooths out the motor, maybe not just the peak power.

Rex

Thanks to all the people that have sent me sleeves to pinch. I have had a few questions.
Yes, you need to send the piston and sleeve.
Turn around is usually one day, more for a whole motor.
I do offer discounts for multiple motors or sleeves.
Cost is $15.00 for a pinch if you send me the piston and sleeve, $35.00 to go through the whole motor, includes bearing replacement, pinch cleaning etc. This includes shipping back.


You can just send the motor or sleeves to my address, I will only need payment before sending it back.

Rex Welch
2136 Mingo View Dr.
Wanamingo, Mn 55983

Thanks!

Rex

James, who's crank is that? OMG!

Wow, great prices!

David, I met you down at Extreme at the pro series in June, Kendall Welch is my son.

Rex

Just a reminder, padded envelopes work best when sending a piston and sleeve. Usually a box for motors. shipping is included back but let me know if you want insurance, I'll have to charge extra for that.

Thanks!

Rex

Rex,

Unbelievable price man! You so have an S5 coming your way! Paypal? or how do you prefer?

Matt

I only require $ before I send it back. paypal is preferred, address is [email protected]
I just realized I have since changed the price of rebuilding a motor. I increased it to $35.00 since shipping is usually more than $5.00 now. A p/s pinch is still $15.00

Rex

No problem. Still a deal. I'd even pay a little more if feel you like working a little magic on it.;) I'll be sending it off Friday when I get back home.

hey i have a go 3pr motor im think about have u to pinch the sleeve could u tell me about how many gal of feul is the pinch good is a pinch sleeve good for.
Thank You

A pinch will last as long as it did before the pinch. There are many factors though, dirt and heat being the biggest ones.

Rex

How do can you tell if you just need a pinch or a rebuild?

Mainly the motors I rebuild are for guys that don't feel comfortable taking there motor apart and getting it back together right. But there are quite a few things to look for, main one being if the crank is worn. Bearings can be a little tricky to tell if they need replacing, you really can't tell until the bearing is totally clean.

Rex

Hey Rex are you and kendall gonna make round 2 fergus ? if so bring that V-spec P+S for buddy...how much does he owe ya ?

We should be there if the weather is good.
$15.00
See ya there!

Rex

Rex,

I'm planning on sending you an S5 for a rebuild. What would it cost me extra to get you to mod it for me as well?

You around Rex?

I charge $40.00 for a basic mod, I will mod it cheaper if I already have it apart to pinch or put in bearings etc.

Rex

Just got my piston and sleeve back today from Rex. Nice and clean and everything went together nicely. I won't be able to fire it up for a bit, but I've had enough sleeves pinched to know this one is going to fire right up and be like new. It's back to where a good running engine should be. Pops nicely when ya roll it over by hand. Great service and can't beat the price. Thanks Rex.
: )

Your welcome! It is easier to pinch a motor when I have the whole thing, if I get done and it doesn't have a nice pop I redo it. It's a little harder to do with just the p/s but that's where experience helps. I'll always redo one for free if it's not right or doesn't last.

Rex

hey Rex could u pm me your address i would like to send my go 3 port r to u to get some work done to it thank u

Pm sent Paperman.

Thanks,

Rex

hey rex i got the info u should get the motor one day this week.
thank you

I have been meaning to send you a RB WS7II for a couple of weeks, I will get it out in the next couple days.

I am now tooled up to lighten and epoxy ramp crankshafts. I will mod a used engine but it needs to be in good condition and within my specs.

Rex

Kendall ran my newest 5 port Go last weekend. He said it out pulled everything, even at a small indoor track.
It has a lightened and polished crank and some timing changes for more rpm.

$240.00 for a new one

Rex

09 prices and services

piston and sleeve pinch $15.00
Motor rebuild $35.00 return shipping included to Us. on both

Basic mod $40.00 crank and sleeve blending and timing adjustments
full mod $50.00 includes crank lightening and epoxy ramp
Discount when rebuiding and modding, I will mod a used motor but the crank and rod can not be worn much.

Rw 5 port $240.00 epoxy ramp crank, mod, and timing adjustment per customer needs. Any shims added for timing can be removed to make it back stock again!

Rw 3 port sport $145.00 This sucker kicks butt, and it's a sleeper!

I will pre set needles on all motors for break in if wanted. I will tell you how to shim it after break in. I will also rebuild motors I sell at a discount.


Rex

I am also breaking in motors now.
Prices
$20.00 extra on anyew motor I modded
$30.00 with any new Go motor bought from me
$40.00 for any other motor sent to me.

Heat cycle method on a Hudy break in bench.

I will be on Vacation in late April so there will be some delays then.

Rex

to the top, when sending in the engine for pinching do i need to do anything in the way of prep to it or should i just send it as it sits?


Go 3 port sport question, when removing shims for 20% which one should i remove?

hey Rex i might send in the Frankenstein JPX to get a pinch....Just giving you a heads up. :nod:

When sending the whole engine just send it dirty. I dissasemble and clean it first. I do get a little annoyed with people that leave clutches on, it takes more time to take that off than to dissasemble the motor. I have been pretty swamped , I came home from last weekends race with over 10 motors to rebuild. Plus I have a couple new Go 5 ports to mod.

On the 3 port sport for 20% I would remove both brass just use the aluminum.

Nick, I'll be watching for Uncle Fester dropping the motor off.

Rex

:lol:

I am starting to get caught up from the 12 motors I had to rebuild. I am now charging $15.00 to retime a stock 5 port when bought new, nice thing is you can change it back. It will smooth out a stock 5 port on the bottom and give it more top end, pretty much makes it an awesome buggy motor.

Rex

I will be on vacation June 21 -27 any motors I get will be done the week after that.
I see some people have mailed piston and sleeves in the priority envelopes and boxes. The cheapest way is to send it in a padded envelope, probably under $2.00 from anywhere in the Us. Then I have a padded envelope to send it back in then!

Rex

Wow, good prices, I may just send my LRP 28 in for a rebuild after this gallon of fuel. Still has a little pinch left, and gobs of compression so better get it worked on soon. 6 gallons of driving does a lot to an engine. Especally when you factor in 1 gallon's worth of time in free- revving due to diff issues :cry:. May I "ask" (out of curiosity) in a nutshell what you do in the rebuild, i guess you just go through, find out what is worn, fix it up, re-pinch and ship out :confused: