Blata B1 Rep MT-A4 - Pocket Bike Forum - Mini Bikes
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post #1 of 29 (permalink) Old 3 Weeks Ago Thread Starter
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Blata B1 Rep MT-A4

Hello all, just bought a Blata rep brand new. Any tips on running it in? I don’t want to full rev it all the time but that seems to be the only way to get the back wheel moving. Any tips on maintenance/gaining power? Where would I get parts. What would be the first things to be after? Many thanks.
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post #2 of 29 (permalink) Old 3 Weeks Ago
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Re: Blata B1 Rep MT-A4

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Originally Posted by Tonck1 View Post
Hello all, just bought a Blata rep brand new. Any tips on running it in? I don’t want to full rev it all the time but that seems to be the only way to get the back wheel moving. Any tips on maintenance/gaining power? Where would I get parts. What would be the first things to be after? Many thanks.
Welcome to the site...

First thing I'd do is get a small RPM gauge to set the clutch RPM by..

theres a way of measuring the springs also but becomes less accurate as the clutch wears out...…….

I'd use the highest octane pump gas that's non-ethanol blend mixed with non synthetic 2 stroke oil is very much preferred for the first 3-4 tankfuls mixed at 32:1…

I would still use non-ethanol fuels like VP brand 95 octane in 5 gallon cans after break-in too but change-up to synthetic based 2 stroke oil......

Fuels blended with ethanol tend to make the tune a lot more erratic in racing bikes...

Even though its a replica Id follow Blatas directions....

Heres the online manual...……Read it well and thoroughly as it touches upon lots of good points especially when filling the cooling system..…..

https://www.manualslib.com/manual/84...B1.html#manual

Good Luck with it...

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Last edited by CAM2; 3 Weeks Ago at 06:09 PM.
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post #3 of 29 (permalink) Old 3 Weeks Ago Thread Starter
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Cheers for the reply mate. What does setting the clutch with an rpm gauge entail? I’ve had to swap the clutch out for the spare that I was given as it was a missing a shoe? Seems to have disintegrated in there so replaced with the spare provided and just set the spring sizes to what was suggested (20.8mm).
Thanks for the Blata manual link.
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post #4 of 29 (permalink) Old 3 Weeks Ago
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Re: Blata B1 Rep MT-A4

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Originally Posted by Tonck1 View Post
Cheers for the reply mate. What does setting the clutch with an rpm gauge entail? I’ve had to swap the clutch out for the spare that I was given as it was a missing a shoe? Seems to have disintegrated in there so replaced with the spare provided and just set the spring sizes to what was suggested (20.8mm).
Thanks for the Blata manual link.

Go to page 23 of the manual I provided for info on the clutch..

Like I said you'll want to read the whole manual thoroughly...

It tells you everything you'd ever need to know...

Good Luck with it and You're Welcome..

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post #5 of 29 (permalink) Old 2 Weeks Ago
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Re: Blata B1 Rep MT-A4

Nice bike man! I would kill for a b1 rep like that. Make sure you take good care of that or im gonna have to take it off your hands
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post #6 of 29 (permalink) Old 2 Weeks Ago
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Re: Blata B1 Rep MT-A4

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Nice bike man! I would kill for a b1 rep like that. Make sure you take good care of that or im gonna have to take it off your hands
You can get them through Ali-Baba...…

Retail they were $650.00 starting back in 06 so the $120-$250 per unit is a steal…..The tough part is finding a seller that sells just one bike...…

Some sellers sell them in 3 , 5 ,20 also 50 units...

https://www.alibaba.com/product-deta...5d06645etmNJk0

https://www.alibaba.com/product-deta...5d06645etmNJk0
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Last edited by CAM2; 2 Weeks Ago at 09:42 PM.
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post #7 of 29 (permalink) Old 2 Weeks Ago
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No response time or transactions is bad news....

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post #8 of 29 (permalink) Old 2 Weeks Ago Thread Starter
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I got mine through eBay here in the uk. Brand new £220 delivered. Seems like the clutch doesn’t engage untill 3/4-full revs the wheel doesn’t spin before this. Is that normal? I’m scared to full rev it atm as it still needs running in. Any suggestions on a better carb? I’ve ordered carbon reed petals, I hear if you change for a bigger carb I need a new inlet? Thanks lads 👍🏻
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Can you send us a picture of the bike ???

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post #10 of 29 (permalink) Old 2 Weeks Ago Thread Starter
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Can you send us a picture of the bike ???
Here you go mate. That’s it pretty fresh out the box
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Quote:
Originally Posted by Tonck1 View Post
I got mine through eBay here in the uk. Brand new £220 delivered. Seems like the clutch doesn’t engage untill 3/4-full revs the wheel doesn’t spin before this. Is that normal? I’m scared to full rev it atm as it still needs running in. Any suggestions on a better carb? I’ve ordered carbon reed petals, I hear if you change for a bigger carb I need a new inlet? Thanks lads 👍🏻

You can set the engagement speed on the clutch. It should reach around 8000rpm.
A dellorto phva 17.5mm carburetor works very well on these engines.
You should have an intake manifold with an aluminum nozzle on it, you can remove this aluminum part then a phva 17.5mm and also a phbg 19mm should fit.

Get your kick with 2 stroke mix
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post #12 of 29 (permalink) Old 2 Weeks Ago
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Right on 🙂 on those ones you can back off the set screws slightly to make it engage at a lower rpm
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post #13 of 29 (permalink) Old 2 Weeks Ago Thread Starter
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Quote:
Originally Posted by Chrisi View Post
Quote:
Originally Posted by Tonck1 View Post
I got mine through eBay here in the uk. Brand new £220 delivered. Seems like the clutch doesn’t engage untill 3/4-full revs the wheel doesn’t spin before this. Is that normal? I’m scared to full rev it atm as it still needs running in. Any suggestions on a better carb? I’ve ordered carbon reed petals, I hear if you change for a bigger carb I need a new inlet? Thanks lads 👍🏻

You can set the engagement speed on the clutch. It should reach around 8000rpm.
A dellorto phva 17.5mm carburetor works very well on these engines.
You should have an intake manifold with an aluminum nozzle on it, you can remove this aluminum part then a phva 17.5mm and also a phbg 19mm should fit.
I read that people have been breaking the manifold trying to do this mod? Anywhere to buy the inlet manifold that suits the bigger carb? Also if I was to buy a 17.5 dellorto, what would I need to do in terms of jets? I’ve took carbs apart and cleaned them before on 2t crossers but don’t know anything about different jets and all that.
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Setup at a phva 17,5mm

Main jet 90-100
Low jet should be about 34 +/- 1
Needle A 07

You can also use a 18 or 19mm phbg
Manifolders are available at alibaba for both carb Typs.
I can also make you an offer, if interested pm me.

Get your kick with 2 stroke mix
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post #15 of 29 (permalink) Old 2 Weeks Ago
Re: Blata B1 Rep MT-A4

You can buy a C1 rubber/steel intake for 17 or 19mm Dell PHBG or clone carb, have both on my 50cc C1. My broken 14mm manifold I cut the the alum piece out. It fit right into 19mm intake, so you can run a 14mm Dell SHA carb or pull it to use a 17 or 19mm carb. Much better than changing manifolds, lol.

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I’ve read if I go 16/16 dellorto then it’s only the main jet to be changed out so it’s a nicer introduction to carb tuning rather than 3-4 jets to be changed out for subtle differences.
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post #17 of 29 (permalink) Old 2 Weeks Ago
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Re: Blata B1 Rep MT-A4

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Originally Posted by Tonck1 View Post
I’ve read if I go 16/16 dellorto then it’s only the main jet to be changed out so it’s a nicer introduction to carb tuning rather than 3-4 jets to be changed out for subtle differences.
Its a lil more to tuning a 16/16 than you think...Especially when downsizing a carb size...…….

The mainjet is just one piece...Theres different types of sliders with different heights angles and cutouts too.



It may be a simplistic design but you need a carb with better diversity and over-all ability.

If you're not too adept on how to keep that engine tuned and in the sweetspot with the carb it simply comes with by simply turning the air/fuel adjustment screw or swapping out a pilot or main jet the only alternative I see is retrofitting a pumper carb on it...……

Usually getting rid of the rep carb and swapping it out for the real deal DelOrtto works out a lot better...………….

You get this carb with the intake EPR stated he uses plus a few mainjets for the carb and you'll be a lot better...

https://www.mopeddivision.com/dellor...rburetor-1407/

https://www.drowsports.com/dellorto-...mm-carburetor/


Its also possible to modify the replicas to work just as good as the real deal DelOrttos too but that's kind of advanced stuff...I did it on my 5 port cag with a 19mm...….



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Last edited by CAM2; 2 Weeks Ago at 07:26 PM.
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post #18 of 29 (permalink) Old 2 Weeks Ago
Re: Blata B1 Rep MT-A4

**** CAM2, Love that Blata engine that boat must fly, lol. Yes, my clone dell 19mm PHBG carb has a 1.01mm main jet, it would bog on anything less than than. But it runs rich on the low side, the carb is really to big for a 46cc engine. the 39cc has 37mm bore and 37mm stroke, the 50cc 39.5mm bore and 37mm bore. Mine has a 40mm bore and a Banshee Sho polini clone 40mm piston which is a little to high but makes great compression.

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post #19 of 29 (permalink) Old 2 Weeks Ago Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Tonck1 View Post
I’ve read if I go 16/16 dellorto then it’s only the main jet to be changed out so it’s a nicer introduction to carb tuning rather than 3-4 jets to be changed out for subtle differences.
Its a lil more to tuning a 16/16 than you think...Especially when downsizing a carb size...…….

The mainjet is just one piece...Theres different types of sliders with different heights angles and cutouts too.



It may be a simplistic design but you need a carb with better diversity and over-all ability.

If you're not too adept on how to keep that engine tuned and in the sweetspot with the carb it simply comes with by simply turning the air/fuel adjustment screw or swapping out a pilot or main jet the only alternative I see is retrofitting a pumper carb on it...……

Usually getting rid of the rep carb and swapping it out for the real deal DelOrtto works out a lot better...………….

You get this carb with the intake EPR stated he uses plus a few mainjets for the carb and you'll be a lot better...

https://www.mopeddivision.com/dellor...rburetor-1407/

https://www.drowsports.com/dellorto-...mm-carburetor/


Its also possible to modify the replicas to work just as good as the real deal DelOrttos too but that's kind of advanced stuff...I did it on my 5 port cag with a 19mm...….



Good Luck



Thanks mate. Good work!
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post #20 of 29 (permalink) Old 2 Weeks Ago Thread Starter
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Quote:
Originally Posted by Chrisi View Post
Setup at a phva 17,5mm

Main jet 90-100
Low jet should be about 34 +/- 1
Needle A 07

You can also use a 18 or 19mm phbg
Manifolders are available at alibaba for both carb Typs.
I can also make you an offer, if interested pm me.
Yeah, sounds like the 17.5 is best mate. What is alibaba btw? Never heard of it. Would be nice to get a kit that will just bolt on.
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