Problems with 1p39fmb motor - Pocket Bike Forum - Mini Bikes
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post #1 of 28 (permalink) Old 03-03-2020 Thread Starter
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Problems with 1p39fmb motor

I bought what looks like an x12 with what seems to be a 50cc motor. The block is stamped 1p39fmb and it has a starter on the bottom.
I've looked for the exact motor and can only find it with the starter up top. I need new cylinder head bolts but can't find them anywhere. Can anyone point me in the right direction? 20200303_170637_1583276598836.jpg
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post #2 of 28 (permalink) Old 03-03-2020
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Re: Problems with 1p39fmb motor

It is a 50cc, 49CCM3 on the cyld. You need long studs out of the cases, by the cyld & thru the head with nuts on top. Never seen an X12 with a 50cc 4 stroke, mostly 110cc engines. It is an automatic, no shifter and no kick start which means you need a battery to start it,

Its a China clone Honda horizontal 4 stroke. You can go to 70cc, or get an 88c hp kit which will beat a 110cc. Check out www. tboltusa .com, they have everything you need. Not sure if you have an X12. My X18 is a 110cc, 4 speed manual clutch lever,
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post #3 of 28 (permalink) Old 03-03-2020
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Re: Problems with 1p39fmb motor

He needs these...……….

https://www.ebay.com/itm/Honda-engin....c100903.m5276
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post #4 of 28 (permalink) Old 03-04-2020 Thread Starter
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Thank you for the info. I hope these studs will work the ones I ordered were too long.
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post #5 of 28 (permalink) Old 03-04-2020
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Re: Problems with 1p39fmb motor

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Originally Posted by Spliffstar View Post
Thank you for the info. I hope these studs will work the ones I ordered were too long.
You mustve gotten the longer stroke 125cc studs.....

These are for an original stroke 50cc/70cc engine

Those engines are stamped 50cc but if you measure the piston it tells the real tale....Years back the crafty Chinese used to cast 70cc engines as 50cc to get them through customs faster.

Good Luck
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post #6 of 28 (permalink) Old 03-04-2020
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Re: Problems with 1p39fmb motor

Measure cyld ID or piston OD and post it here, CAM2 is right you might have a 70cc.
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post #7 of 28 (permalink) Old 03-04-2020
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Re: Problems with 1p39fmb motor

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Originally Posted by EPR View Post
Measure cyld ID or piston OD and post it here, CAM2 is right you might have a 70cc.
As you know 110cc engines are stamped 107cm3.....Look at the cylinder of one of my X15's is stamped..

It says 108cm3 but in the pic its actually a lot larger.........LOL




Last edited by CAM2; 03-04-2020 at 01:18 PM.
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post #8 of 28 (permalink) Old 03-05-2020 Thread Starter
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Quote:
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Measure cyld ID or piston OD and post it here, CAM2 is right you might have a 70cc.
Exactly what do I measure? Is it the width of the bore?

I took it to a shop and the lady says she believes the bike is an X7 cateye.
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post #9 of 28 (permalink) Old 03-05-2020 Thread Starter
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Originally Posted by CAM2 View Post
Quote:
Originally Posted by Spliffstar View Post
Thank you for the info. I hope these studs will work the ones I ordered were too long.
You mustve gotten the longer stroke 125cc studs.....

These are for an original stroke 50cc/70cc engine.

Those engines are stamped 50cc but if you measure the piston it tells the real tale....Years back the crafty Chinese used to cast 70cc engines as 50cc to get them through customs faster.

Good Luck
I assume that's what happened they are about an eighth of an inch longer. I guess I'll keep them for the day I buy a larger head.
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Re: Problems with 1p39fmb motor

Quote:
Originally Posted by Spliffstar View Post
Exactly what do I measure? Is it the width of the bore?

I took it to a shop and the lady says she believes the bike is an X7 cateye.
Post a picture of it and Ill positively ID it for certain...…...
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Re: Problems with 1p39fmb motor

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I assume that's what happened they are about an eighth of an inch longer. I guess I'll keep them for the day I buy a larger head.
Why don't you just simply cut them down to size?

I cut bolts and screws down all the time in this hobby...

the trick is to thread a nut up to the length,use the nut as a guide,make the cut ,screw nut up further hit the threads with a file and unscrew the nut.....

In this picture not only did I shorten the threads but I also added threads 3/8" higher with a cutting die,,,,,,


Last edited by CAM2; 03-05-2020 at 10:38 AM.
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Re: Problems with 1p39fmb motor

CAM2, them bolts look like the head/cyld you used to redo the whole billet case 40cc Cag engine. Star, this is some of CAMs work.
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File Type: jpg 47cc Billet Cag Eng1.jpg (277.0 KB, 2 views)
File Type: jpg 47cc Billet Cag Eng2.jpg (285.3 KB, 2 views)
File Type: jpg 47cc Billet Cag Eng3.jpg (148.5 KB, 2 views)
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Re: Problems with 1p39fmb motor

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CAM2, them bolts look like the head/cyld you used to redo the whole billet case 40cc Cag engine. Star, this is some of CAMs work.

Yes sir....fastest and clearest pics I could find...………...LOL
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post #14 of 28 (permalink) Old 03-09-2020 Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Spliffstar View Post
Exactly what do I measure? Is it the width of the bore?

I took it to a shop and the lady says she believes the bike is an X7 cateye.
Post a picture of it and Ill positively ID it for certain...…...
Here is what I have without the fairings
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post #15 of 28 (permalink) Old 03-09-2020 Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Spliffstar View Post
I assume that's what happened they are about an eighth of an inch longer. I guess I'll keep them for the day I buy a larger head.
Why don't you just simply cut them down to size?

I cut bolts and screws down all the time in this hobby...

the trick is to thread a nut up to the length,use the nut as a guide,make the cut ,screw nut up further hit the threads with a file and unscrew the nut.....

In this picture not only did I shorten the threads but I also added threads 3/8" higher with a cutting die,,,,,,

To be honest I just wasn't comfortable doing it but after reading your method and watching a few videos I will attempt it next time. However the bolts you suggested showed up and worked perfectly. Tomorrow i will be working on the wiring harness.
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Re: Problems with 1p39fmb motor

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To be honest I just wasn't comfortable doing it but after reading your method and watching a few videos I will attempt it next time. However the bolts you suggested showed up and worked perfectly. Tomorrow i will be working on the wiring harness.

Very nice....
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Re: Problems with 1p39fmb motor

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Here is what I have without the fairings
You indeed have an X12...……Its a Chinese version of a Ducati 749 ripoff……




Just be wary of those cookie cutter rims theyre fragile and crack easily at the rim hub area when laying the bike down in highspeed sweepers...…….

Last edited by CAM2; 03-09-2020 at 11:24 AM.
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post #18 of 28 (permalink) Old 03-09-2020 Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Spliffstar View Post
Here is what I have without the fairings
You indeed have an X12...……Its a Chinese version of a Ducati 749 ripoff……




Just be wary of those cookie cutter rims theyre fragile and crack easily at the rim hub area when laying the bike down in highspeed sweepers...…….
Thank you for confirming. I don't plan on riding this thing to hard but thank you for the advice. I suppose I'll have to add rim's to my list.
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Re: Problems with 1p39fmb motor

Don't put a lot of side pressure on the rims. and you will be ok, and keep looking at the hubs to see if any cracks show up.
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post #20 of 28 (permalink) Old 03-11-2020 Thread Starter
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Don't put a lot of side pressure on the rims. and you will be ok, and keep looking at the hubs to see if any cracks show up.
Thank you I appreciate it and will keep that in mind. And I thank you both for taking the time to help. I will continue to post my progress here.
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