jonny56
Scoot Member
Posts: 65 
Location: UK
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Post by jonny56 on May 2, 2016 16:42:46 GMT -5
Hello Im new to the forum and have recently started Charity scooter racing.
I currently have a 2004 Yamaha Jog R with the AC engine with the following installed:
Technigas QTRE exhaust
Naraku sports variator
Naraku 50cc cylinder and piston kit
Naraku air filter (in standard airbox)
we previously seized the engine so I bought the piston kit above which happend to be the same as the one installed already. Since installing it we noticed the scooter is rather slow and struggles to hit 41mph and has slow pick up and acceleration. The last cylinder had the exhaust port exit round and similar in size to the exhaust but the new cylinder has a D-shape exit. Would grinding this to match the exhaust make any diffrence?
Next up I have purchased a complete Jog RR LC engine from a 2014 bike with all rads but no carb/starter motor.
We are looking to spend around £250 on this engine to upgrade it but using the same exhaust,air filter,variator as the AC engine to keep cost down.
What would be the best direction to go for this within £250 but keeping it as a 50cc due to the class its raced in.
Cheers guys and gals
Jonny
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Post by aeroxbud on May 2, 2016 17:25:05 GMT -5
Welcome Jonny.
A lot of the standard Yamaha/MBK exhaust ports are D shaped. It does not make a lot of Difference to the performance by matching it to the exhaust. If ultimate performance is your goal I would do it though.
Not sure but Is the older engine vertical and the LC motor horizontal?
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jonny56
Scoot Member
Posts: 65
Location: UK
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Post by jonny56 on May 2, 2016 17:32:47 GMT -5
Cheers I wasnt too sure what it would do. Both engines are horizontal.
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Post by Lucass2T on May 3, 2016 1:23:29 GMT -5
I'd say go for a aircooled 50cc Stage 6 cylinder and a 19mm dellorto PHBG carburetor. That way you should stay within budget but gave a huge performance boost over the stock cylinder! Those 50cc's from stage 6 are great (from the athena factory)! Cylinder  You can go with the normal PHBG or the 'racing' which has a chromed throttle slide and easy jet swap and needle swap system. Performance wise there's no difference.   |
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jonny56
Scoot Member
Posts: 65
Location: UK
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Post by jonny56 on May 3, 2016 4:04:19 GMT -5
Would it be better to buy the LC kit? The exhaust should fit both the AC and LC engine.
What are peoples thoughts on the Malossi MHR T6 cylinder kit? I have seen them for £155
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Post by Lucass2T on May 3, 2016 9:13:47 GMT -5
Would it be better to buy the LC kit? The exhaust should fit both the AC and LC engine. What are peoples thoughts on the Malossi MHR T6 cylinder kit? I have seen them for £155 AC or LC doesn't really matter that much unless you're living in the desert. LC does have better heat control though which makes it possible to keep tighter tolerances and make (a tiny little) more HP over AC engines. The Malossi Speed/cross 6T is the predecessor of the 7T. Was a top of the market cylinder back in the 90's and early 00's before the 7T came out. You'll need to upgrade your exhaust though...that Technigas is one big restrictor for anything beyond a cast iron BBK or slightly ported 50... |
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jonny56
Scoot Member
Posts: 65
Location: UK
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Post by jonny56 on May 3, 2016 9:26:35 GMT -5
Cheers guys, I guess the T6 is not worth it unless I replace the exhaust.
I will see what deals I can get on the Stage 6.
We will be upgrading the bike bit by bit so just didnt want to by cheap and have to buy again later on.
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Post by 2stroked on May 3, 2016 11:05:00 GMT -5
If you want performance on the cheap, could you open the exhaust pipe, and remove the baffles, and reweld it??? I am not for sure, but have heard that Technigas pipes have baffles inside.
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Post by Lucass2T on May 3, 2016 14:51:09 GMT -5
If you want performance on the cheap, could you open the exhaust pipe, and remove the baffles, and reweld it??? I am not for sure, but have heard that Technigas pipes have baffles inside. Nahh the whole design of that tecnigas is awful for anyone aiming for anything performance wise. I would love to see what a Tecnigas RS70 would do on that cylinder. |
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jonny56
Scoot Member
Posts: 65
Location: UK
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Post by jonny56 on May 3, 2016 15:19:47 GMT -5
If i was to buy the Stage 6 Alu LC and the stage 6 19mm dellorto race carb and a set of jets and rollers what would be a good range of jets to buy and roller weights?
I can purchase the cylinder kit and carb for around £190, is it worth buying somthing like the stage 6 intake manifold with the uprated reed block or leave it standard for now?
Sorry to ask so many questions I have not touched a 50cc 2t for a good 11 years lol
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Post by moofus02 on May 3, 2016 18:09:20 GMT -5
Ok I got a question. Not sure what country you're in but stateside the vino got the 5mb motor and overseas some of the jogs got them. They had an angled Reed block that takes a different bolt pattern than the normal and they had a factory trench job. If you have a set of those cases that is what I would use. If not I would back fill with jb weld and trench them. Lots of info here on that. Makes a huge difference
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Post by Lucass2T on May 3, 2016 18:30:58 GMT -5
If i was to buy the Stage 6 Alu LC and the stage 6 19mm dellorto race carb and a set of jets and rollers what would be a good range of jets to buy and roller weights? Depends on the exhaust. But I would buy 80, 90, 100 and 110. From there you can make a good guess on the next set of jets you're gonna need. Im not a fan of buying pre sorted sets because chances are you buy the wrong set and end up with lots of jets you don't need. But over here in Holland dellorto jets are available on every street corner and are about €2,50 each....dunno how it is over there?
Roller is also depending on exhaust. Do you have a tach? My metrakit exhaust has its powerband peak between 9.500 and 10.500rpm. I have a yellow malossi contraspring and i need 4,2 rollers to keep the revs around 10k.
I can purchase the cylinder kit and carb for around £190, is it worth buying somthing like the stage 6 intake manifold with the uprated reed block or leave it standard for now? You only need carbonfiber or glassfiber reed petals. The stock metal ones can break and ruin your engine. No need to change the intake boot since PHBG carbs perfectly fit into the stock boot. Aftermarket boots have the same shape as the stock one so they don't offer any benefits. You can take a dremel and see if you can smooth out the flow path of the stock reed but I think there's not much to improve there. Sorry to ask so many questions I have not touched a 50cc 2t for a good 11 years lol. |
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jonny56
Scoot Member
Posts: 65
Location: UK
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Post by jonny56 on May 16, 2016 11:39:24 GMT -5
Right I have managed to get all the team members to contribute more money  Does the following sound good: Stage6 50cc LC cylinder kit Stage6 19mm dellorto racing carb Unrestricted CDI What exhaust would you guys say I should get baring in mind Im on a budget lol, I looked at the Stage6 Pro rep or Yasuni R I am also going to run a race air filter so I can use pipework to hide it from mud/water in off road events. Are the Naraku HPC race cranks any good? I looked at the one with plastic inserts or would I need somthing a bit more substansial. Im aiming for around 10hp if possible but obviously more is better. Cheers Jonny |
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Post by spaz12 on May 16, 2016 16:09:18 GMT -5
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Post by ryan_ott on May 17, 2016 9:43:27 GMT -5
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