What engine is R50

bdiesel570 · Post by **bdiesel570** » Sat Jun 16, 2012 10:30 pm

What minarelli engine is the R50? I have been looking for parts and I want to make sure I am ordering the right clutch and stuff.

spr0k3t · Post by **spr0k3t** » Sun Jun 17, 2012 1:03 am

The RH50 uses the Minarelli Horizontal 50. There's a good NCY clutch and I've heard Malossi makes one as well.

bdiesel570 · Post by **bdiesel570** » Mon Jun 18, 2012 3:40 am

How are the Hoca carburetors? I can get a Hoca for about 100 or a Malossi 21mm for 230..is the difference really that big?

I was looking at Dr Pulley HiT clutch and other stuff. and a prima exhaust any suggestions?

spr0k3t · Post by **spr0k3t** » Mon Jun 18, 2012 4:11 am

Well, here's a few things I've got slated for my build...

Stage6 Pro 70 exhaust (best power band you can get if you go for the 70cc BBK)
Malossi MHR 70cc BBK w/ 12mm sleeve and new crankshaft

Debating on either a Makuni or Malossi 21mm carb. I've never had a chance to really tune the HOCA on a 2T, most of the HOCA carbs I've seen were on the GY6-clone china bikes. Makuni and Malossi on the other hand, I've done many of them, so if you are familliar with the setup, go for it. Just keep in mind the size may be listed as one, but the actual throughput from intake to outlet may be different. A good example, have a look at most Makuni carbs.

Clutch is either going to be a Malossi Delta MHR with the overdrive variator, the Dr Pulley Hit Clutch, or the Stage6. Not sure if there is a size restriction yet... still waiting to hear from the vendors.

Obviously I'm building a prostreet/racing setup... so I'm doing some extra legwork before really starting to order. In a couple weeks, I'm going to pull the engine and do a full work up if I have enough time.

SuperCyclone.81 · Post by **SuperCyclone.81** » Mon Jun 18, 2012 3:36 pm

That sounds awesome man, its gonna be a beast haha.

bdiesel570 · Post by **bdiesel570** » Mon Jun 18, 2012 5:00 pm

You can buy the pipe and run it before doing a BBK right on a the scooter? I like the stage6 exhaust, that shit will be awesome I think.

spr0k3t · Post by **spr0k3t** » Mon Jun 18, 2012 5:46 pm

You can buy the pipe prior to a BBK, just keep in mind you would have to tune the setup multiple times. This would more than likely include a bigger jet, heavier rollers, different contra spring etc. It's worth it if you are learning how to do the tuning/tweaking.

Yeah... it may sound crazy, but I'm hoping I can get it below the 8 second quarter mile when it's all said and done.

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 2:41 am

Ok I am going to order that stage6 pro 70 I just want to learn to tune and tweak myself

eventually will get a bbk and bigger carb once I have more money.

spr0k3t · Post by **spr0k3t** » Tue Jun 19, 2012 3:17 am

You should be aware of something before you do go ahead with your order.

I've found the engine of the RH50 is extremely close to the 140QMB (aka Minareli Horizontal 49cc), but there are some very minor differences here and there. It may take a small bit of modification to the exhaust... but nothing a local exhaust shop couldn't fix in a few minutes. If the exhaust is a direct bolt up without modifying, awesome, I'd like to verify that.

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 3:22 am

ya I haven't ordered yet, still deciding on what to get, trying to look over reviews. Hmm, I wish they had shit just made for genuine I know its a minarelli just wish they made specific shit.

makes my life difficult

spr0k3t · Post by **spr0k3t** » Tue Jun 19, 2012 3:53 am

If you are able to wait about a month or so, it is one of the parts I'm slated to order for my build. There are probably two other pipes I'll be ordering to verify fitment. The only cost I will be out is shipping it back. I have a fantastic welder willing to work with me on the Stage6, so it should be interesting when it is all said and done.

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 4:42 am

What is the best oil to run in the engine? I will wait a month to hear how the exhaust works

spr0k3t · Post by **spr0k3t** » Tue Jun 19, 2012 11:51 am

Any dino oil that can go to 100:1 mix is fine. I personally like synthetics after 1000 miles. I like to use Royal Purple, AMSOil, or even Bel Ray. The key factors are to look for the supported mix of 100:1 ratio. Some of the cheap brands you will find buildup when doing a teardown. If you build up your engine quite a bit, you will have to plan for rebuilds. Using good quality oil will extend the life quite a bit.

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 3:20 pm

Wha about engine oil? 10w40?

gitsum79 · Post by **gitsum79** » Tue Jun 19, 2012 3:32 pm

bdiesel570 wrote:Wha about engine oil? 10w40?

oh-oh

A two-stroke engine does not use four-stroke engine oil. Gear oil in the transmission and two-stroke oil in the oil tank. The oil tank has to be refilled and cannot be allowed to run out.

Below is a link to a forum that might be helpful before doing any upgrades?

http://49ccscoot.proboards.com

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 4:03 pm

Thats what i thought. Just waa making sure when i used to ride quads they were 2 stroke but used oil in the engine gmm

Ray Knobs · Post by **Ray Knobs** » Tue Jun 19, 2012 4:37 pm

bdiesel570 wrote:Thats what i thought. Just waa making sure when i used to ride quads they were 2 stroke but used oil in the engine gmm

say what?

bdiesel570 · Post by **bdiesel570** » Tue Jun 19, 2012 5:33 pm

Nervermind im retarded.

spr0k3t · Post by **spr0k3t** » Tue Jun 19, 2012 6:55 pm

It's okay man... we've all been there.

bdiesel570 · Post by **bdiesel570** » Wed Jun 20, 2012 1:45 am

actually im not retarded, I am just new to scooters haha. I did use 4T oil in my banshee, we just didn't use gear oil. I figured that you had to use a different oil other than the premix.

the banshee was 2T but I used 4T oil in the crankcase. Whatever scooters are different.

So I changed the oil in the crankcase and I think I put the correct amount in I don't want to overfill so the seals blow up. I drained it then added 100cc to the crankcase. hopefully that wasnt to much

agrogod · Post by **agrogod** » Wed Jun 20, 2012 8:44 am

bdiesel570 wrote: .....the banshee was 2T but I used 4T oil in the crankcase. Whatever scooters are different.

.....

I've used anything from a weed eater up to MC and 2T is 2T. You may have used 4T oil in the gear housing, but I find it hard to believe you put 4T in the crank. Scooters are no different other than the fact that some you still premix and some have auto injection for the 2T oil.

bdiesel570 · Post by **bdiesel570** » Wed Jun 20, 2012 3:08 pm

Ya i am just learning to tune stuff now. I rode quads when i was like 12 so i am trying to recall what i did to it. My neighbor did the honeing of the cylinders and he put new heads and stuff on it i didnt do the work i just watched. Now i get to learn to tune on my scoot. This forum
Is extremely helpful! Thanks for the advice

nissanman · Post by **nissanman** » Thu Jun 21, 2012 12:03 pm

Did you change your gear oil? 90-100cc is fine. If you over filled there is a small weephole that will drip gear lube all over your rear tire... I have no 1st hand knowledge of this at all

bdiesel570 · Post by **bdiesel570** » Thu Jun 21, 2012 5:58 pm

sweeeet thanks no weepage!

spr0k3t · Post by **spr0k3t** » Sat Jun 23, 2012 7:49 pm

Just wanted to post an update real quick. The stage6 70 pro has been ordered. Once I get it in, I'll be taking it to a local shop to make sure everything is going to mate up correctly. Not sure if I will need to fab up a shim plate, but if one is needed, I'll get you a price quote to have one made.

spr0k3t · Post by **spr0k3t** » Wed Jun 27, 2012 10:31 pm

So the Stage6 is out. I've been digging for quite a while to find one and my order has been cancelled at five different locations, noone has them available anymore. Stage6 has said they will not have any more stock until they have a large batch pre-ordered. So then, moving on the next best one I can find, LeoVince HM 70. If that one doesn't work, I'll be moving on to the Technigas RS2 pipe. I know for a fact the Technigas pipe is a direct fit though. The only recommendation would be to use a better exhaust gasket and possibly do a port matching for optimum performance.

agrogod · Post by **agrogod** » Thu Jun 28, 2012 9:15 pm

You have to be careful with the Technigas, even though the pipe fits the retention bracket may not.

spr0k3t · Post by **spr0k3t** » Thu Jun 28, 2012 11:56 pm

I shouldn't have a problem with that. I can fabricate brackets.

Maker · Post by **Maker** » Thu Jun 28, 2012 11:59 pm

Can you fabricate that front headlight guard I liked so much? Lol

spr0k3t · Post by **spr0k3t** » Fri Jun 29, 2012 1:56 am

Well, my cuts are not that clean... and I can do simple brackets. I have a guy locally who has access to a full billet CNC machine. So if I pay for the aluminum, the hour it takes to set up and cut most parts, and pay the guy for his work, I can get almost anything made. The only problem is the cost is a bit much for a single run on anything. What I'm hoping, is I will be able to find a simple (albeit much better than the prima) exhaust with minor modification needed where I can make such a bracket and bring the luvins to the rest of you guys here. If I can get the modded bracket made cheap enough, I might be able to get a really good cost to those interested.

spr0k3t · Post by **spr0k3t** » Sat Jun 30, 2012 3:42 am

So this looks promising. I found a Leo Vince HM 70 that will more than likely direct bolt with the exception of the angle of the mounting bracket. Granted it's expensive, but way better than the Prima pipe.

https://www.leovinceusa.com/schematics/ ... T-7414.pdf

I've been talking with a rep and they don't even know if it will work with another Minarelli engine or not. Originally made for the Yamaha Zuma, it may only need a change in the bracket to get it to work. I'm going to talk with my fabricator and see if I can make this happen. Once I get working mount, I'm going to get back in touch with the guys at LV to see about creating a bracket for this pipe so it can be available at a larger volume. While I'm waiting for this exhaust to come in... something else was at my door tonight.

agrogod · Post by **agrogod** » Sun Jul 01, 2012 8:59 am

Looking at the LV pipe schematics you supplied you may have more than just the bracket to contend with. The bend off the exhaust port doesn't look right and may need to be curved more to help the angle match. Some parts off a Zuma do a direct match-up to the RH50 but I don't think the exhaust is going to be one of them.

Have you considered a custom made pipe (made from scratch)?

spr0k3t · Post by **spr0k3t** » Sun Jul 01, 2012 3:45 pm

I have thought about the made from scratch route... I don't think it would fit the bill for me though. Not to mention, I'm trying to help others find a cost effective way to get a decent pipe that will work well without breaking the bank. Don't know about you, but I'd rather not get the prima pipe after reading some of the long term reviews... may as well just go the custom route in the first place.

Stinkdyr · Post by **Stinkdyr** » Sat Apr 19, 2014 1:27 am

agrogod wrote:You have to be careful with the Technigas, even though the pipe fits the retention bracket may not.

Tru dat, AgroGod!! I just found out the hard way that the bracket holes on this pipe are an inch off....for my 2009 RH50:

http://www.ebay.com/itm/Tecnigas-Silent ... 1268948774

Be warned.

agrogod · Post by **agrogod** » Mon Apr 21, 2014 3:23 am

Hey Stinkdyr, with that bracket did you find the top fits perfect and the bottom is off? And from the looks of it you went with the Silent Sport. How is the performance on that.
After 4yrs. of PA. winters and road salts its apparent that I will be running into weld failures at some point in the future. Just want to get a secondhand review of that model so I can decide on a replacement.

Stinkdyr · Post by **Stinkdyr** » Sat Aug 02, 2014 5:57 pm

Hi Agro,

Neither bracket hole lined up well enough to use as is. Since the lower hole was closest, I went at it with a round file to enlarge/migrate the hole a bit NorthEast so the bolt would fit back in. Had to add a metal sleeve behind the bracket to keep the distance right.

It works fine, quite loud, added 5% power. But I would not recommend it. Too much trouble for the slight increase in power. And I don't like it being so loud. But the price was right.

Stinkdyr · Post by **Stinkdyr** » Thu Jan 15, 2015 12:00 am

Further to this change in exhaust pipe, now in the dead of winter, my engine is bogging when I try to accelerate. I suspect the air/fuel mix is too lean due to the new pipe, exacerbated by the dense cold winter air.

So this weekend I will take steps to richen the mix to counteract the pipe mix-leaning effect. (oh, and since the shop snapped off the head of the air fuel mix adjuster screw, that can't be used)...so I will try to adjust via the metering needle that sits above the main jet. Wish me luck.