B1 rep flat spot - Pocket Bike Forum - Mini Bikes
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post #1 of 29 (permalink) Old 08-31-2018 Thread Starter
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B1 rep flat spot

My b1 rep, I ain't had much use our of it yet, just not got time at the minute but, I have it well warmed anytime I have used it and sometimes get this dull flat spot when it won't rev out then all of a sudden,,,it kicks in and off it goes,
Have New plug, petrol filter,cleaned carb but still this flat spot low down
Any advice appreciated to rid me of the dull spot on the rev range
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post #2 of 29 (permalink) Old 08-31-2018
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Sounds like a tuning issue these bikes are very finicky and have to be tuned according to the humidity barometric pressure and temperature your tune may change from day-to-day depending upon your weather patterns

This is what pocket bikers are talking about when they say their bike ran a such and such speed on a good day. A good day means the weather was perfect for their tune...

On a side note it's not uncommon for Racers to adjust their tune midday or even as much as tuning morning midday and evening...

On another note your tune is going to change as your bike wears and it slowly loses compression...

Faster then a speeding E Revo

Last edited by MrKitty; 08-31-2018 at 01:32 PM.
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post #3 of 29 (permalink) Old 08-31-2018 Thread Starter
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It's just a tad slow on the pick up at times then boom....it kicks in full on!
Great bike every other way,solid handling,no leaks from the pump either.
I was thinking of inspecting the reed block gasket and if it's ok...a rejet down a size or also use a good quality 2 t oil as I'm using basically chain saw 2t at the minute.
It really kicks in hard when it does go,hard enough to lift the wheel off the deck
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post #4 of 29 (permalink) Old 08-31-2018
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Re: B1 rep flat spot

sounds like its going lean mid throttle to me try going one jet size bigger

dont run crappy 2 stroke oil on those rep bikes it kills them and fast you might want to do a compression test and see where its at...

mix your oil properly!!!

dont use one shot mixes it will kill it...

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post #5 of 29 (permalink) Old 08-31-2018
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Re: B1 rep flat spot

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Originally Posted by jak_e_lee View Post
It's just a tad slow on the pick up at times then boom....it kicks in full on!
Great bike every other way,solid handling,no leaks from the pump either.
I was thinking of inspecting the reed block gasket and if it's ok...a rejet down a size or also use a good quality 2 t oil as I'm using basically chain saw 2t at the minute.
It really kicks in hard when it does go,hard enough to lift the wheel off the deck
There's parameters the reps must meet in order to run good and that is if the ports are all in the right places too...

Look at the specs of a real euro engine...if your engine doesn't even come close to the specs then you have some work to do...

Alls I'll say coming from where I use them in 7-8ft long fiberglass r/c boats the reps need the squish tightened up,,crankcase blueprinted aswell as getting the carburetor setup right with correct atomizer tube ,needle,barrel and jetting..

The rpm your clutch engages at matters too....On euro engines the clutch engeges at 8k......

Good Luck

Last edited by CAM2; 08-31-2018 at 06:24 PM.
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post #6 of 29 (permalink) Old 08-31-2018
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Re: B1 rep flat spot

The problem is there Junk. I have a 50cc C1, if it's not one thing its another. Might need a coil. Did some one put a 19mm Clone Dell PHBG carb on it.
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post #7 of 29 (permalink) Old 09-01-2018 Thread Starter
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Re: B1 rep flat spot

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Originally Posted by EPR View Post
The problem is there Junk. I have a 50cc C1, if it's not one thing its another. Might need a coil. Did some one put a 19mm Clone Dell PHBG carb on it.
It all looks totally standard to me around the engine.
At 40-1...im possibly using too much oil is a thought i had,50-1 is whats specified for it.
When it goes...it really hammers on,you gotta hold on tight,lol
Its just something basic im missing somewhere.
Start with basics...will get good silkolene 2t oil and go 50-1 is my first thing to try.
Currently using comma mineral 2t bought from the gas station.
At 40-1 ,could be oiling the plug!
Carby is 15mm dellorto clone
I know the carby is nice and clean as is my fuel filter and air filter and the plugs new so its gonna be something basic that heals it,it is after all a real basic single cylinder engine

Last edited by jak_e_lee; 09-01-2018 at 04:12 AM.
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post #8 of 29 (permalink) Old 09-01-2018
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When there is to much oil on the spark, you should not reduce 2 stroke mix, you should reduce main jet of the carb.
Small help for starting mainjet is, carb dia. X 5 + 5%. That is 15mm x 5 + 5%= 78, so give in 0,78mm mainjet into carb and trie again.

Get your kick with 2 stroke mix
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post #9 of 29 (permalink) Old 09-01-2018 Thread Starter
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I took a look today and tightened the jubilee clip around the carb to manifold and the bikes on the money now and useable over the rev range .
I did notice the rad weeping around the top where the mounting bracket rivets to it so I'm have to get someone to braze that for me but for now, il monitor coolant level during use but bikes going great today. Had it up the street and it's way better

Last edited by jak_e_lee; 09-01-2018 at 08:35 AM.
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Right on man ride em till they blow that's what I always say 🙂

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Re: B1 rep flat spot

That's a 14mm clone Dell SHA carb, the 5x times bore is a good starting place.
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post #12 of 29 (permalink) Old 09-01-2018 Thread Starter
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Took it out an hour ago and fried the clutch😂
I took of the bell and half a shoe liner dropped out.
I think this bike has laid up unused for a long time but it was going great until the clutch **** itself .
New one ordered so back in action next week.
Sticking with twin shoe clutch

Last edited by jak_e_lee; 09-01-2018 at 03:08 PM.
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best to order three clutches it's a common problem on them 🙂

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No problem on them, just order one good clutch, like zocchi, cs or somthing else and not 10 of the cheap china clutches.
Then take a time to run in and adjust the clutch and it will work a long time.

Get your kick with 2 stroke mix
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it's not worth it on a china rep bike because it's just a matter of time before something else breaks then you've wasted a bunch of money on a clutch

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Re: B1 rep flat spot

Can you post a photo of the 2 shoe clutch your using. I got mine so hot the whole pad came off the arm, I thought I broke the engine at first.
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Quote:
Originally Posted by MrKitty View Post
it's not worth it on a china rep bike because it's just a matter of time before something else breaks then you've wasted a bunch of money on a clutch
There is no wasted money on a good clutch, try it and you will see what i mean.

Get your kick with 2 stroke mix
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I onley use the clutch for take off then once it hits full lock I intend to keep it locked bliping and reving is what kills them lots of begeners like to give the bike a few quick blips before take off or they stop and let the clutch unlock or both and melt the epoxy that holds the pad to the arm

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Quote:
Originally Posted by MrKitty View Post
I onley use the clutch for take off then once it hits full lock I intend to keep it locked bliping and reving is what kills them lots of begeners like to give the bike a few quick blips before take off or they stop and let the clutch unlock or both and melt the epoxy that holds the pad to the arm
Thats right.
And the next problem of china clutch is setting the spring. Just change the spring to original blata and it works. Mostly need also a smaller clutchbell, because they dosn't fit on 80mm bell, nearby 78mm bell it works.

Get your kick with 2 stroke mix
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post #20 of 29 (permalink) Old 09-02-2018 Thread Starter
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That's the shoe. It broke in half and then it kept the transmission engaged so I took it off the bike last night. I was blipping the throttle as I'm used to mannua l road bikes. I guess automatics need a different riding technique!
I was in an area i could only use full power for a split second.
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Last edited by jak_e_lee; 09-02-2018 at 02:54 AM.
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