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BSA C15 Trials Project


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#1 broony

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Posted 08 September 2011 - 06:34 PM

I have a long term project on the go at the moment a C15.
Was up the shed tonight and done a dry build on the rolling
chassis,seems like I will have to increase the ground clearance
as its quite low about 9",not very good.The frame is standard,
front forks are standard,What is the best length of rear shockers
to fit to help with the ground clearance.As I said its a long
term project as I'm enjoying riding my 250 Scorpa and learning
every trial I do.Any other advice would be much appreciated.
cheers the noo Brian
Drawn on a fag packet,built in a shed


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#2 solvent3

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Posted 12 September 2011 - 11:23 AM

hi, this is my dads C15T which he got last year. it was standard and had the external sprung forks etc. As you say there isnt too much ground clearance so that was the main task in getting the bike ready. Initially we just replaced the front springs as there was quite a bit of sag in them. This didnt really help much and it was decided that the front forks would be replaced. We settled on MZ forks, not pre 65 but look the part especially when the seal holders are added and i think they were slightly longer than standard so helped again with ground clearance. Also i managed to get some alloy yokes to suit and these were added.

We had the head angle altered slightly to tuck the wheel in which probably gave us a little extra ground clearance and the footrests dropped and moved back a little.

I think the rear shock length is now 360mm, but will need to check. With the mods i think the bike now has around 12-13" of clearance.


Before.

Posted Image Posted Image


After. (have since replaced rear shocks)

Posted Image
Posted Image

#3 broony

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Posted 12 September 2011 - 09:26 PM

Cracking looking bike,if you could let me know the length
of the shocks you used please
cheers the noo Brian

Edited by broony, 13 September 2011 - 04:32 PM.

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#4 bashplate

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Posted 13 September 2011 - 08:23 AM

very nice indeed, and as you say the forks look period.....can you remember what the yokes were off, and if they needed much to make them fit?

#5 solvent3

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Posted 13 September 2011 - 10:02 AM

Hi The yokes were from ebay. They were made by a guy that sells a few cub bits( i have some on my honda too). i think they were about 120?. Needed to get a new spindle made but that was about it. Shock length is now 360mm but 340mm may have been suitable also. I got a set of fork extenders to add up to 80mm to the front but didn't really work.

I have the ebay sellers name but wasn't sure if i could post it here?

#6 old trials fanatic

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Posted 13 September 2011 - 10:27 AM

Hi The yokes were from ebay. They were made by a guy that sells a few cub bits( i have some on my honda too). i think they were about 120?. Needed to get a new spindle made but that was about it. Shock length is now 360mm but 340mm may have been suitable also. I got a set of fork extenders to add up to 80mm to the front but didn't really work.

I have the ebay sellers name but wasn't sure if i could post it here?

120 wow that is cheap. :chairfall: Well done :thumbup:
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#7 solvent3

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Posted 13 September 2011 - 10:58 AM

sorry Paul, just checked yokes were 160

#8 old trials fanatic

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Posted 13 September 2011 - 03:32 PM

sorry Paul, just checked yokes were 160

Still a good price :thumbup:
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#9 broony

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Posted 26 September 2011 - 06:55 PM

Front end finished,looking to build a wheel for the rear,
was wondering what width of rim to use?
cheers the noo Brian
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#10 bashplate

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Posted 27 September 2011 - 07:28 AM

generaly the rear rim width is 1.85 inch, though some bikes use 2.15 inch. as you would still be using a 4 by 18 tyre i'm not sure what difference the wider rim would make to the tyre profile and therefore grip :unsure: .....but the wider rim might make the tyre too "fat" for your swing arm, so i'm guessing you would be better with th 1.85 rim. there'll be a bunch of C15/B40 riders along any minute with their views i'm sure. :lol:


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#11 b40rt

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Posted 27 September 2011 - 10:49 AM

If you haven't bought anything yet go for the 1.85.
If you need George Spence (the wheel builder)tel no just ask. He's at Cupar.

Ross
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#12 broony

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Posted 08 October 2011 - 05:11 PM

Can anyone advise of the final drive for Alf my C15
trials project.
cheers the noo Brian
Drawn on a fag packet,built in a shed

#13 mcman56

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Posted 09 October 2011 - 02:00 PM

For slow tight turns, 428 with 13/72 seems OK with an 18 tooth engine sprocket.

#14 b40rt

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Posted 09 October 2011 - 07:08 PM

For slow tight turns, 428 with 13/72 seems OK with an 18 tooth engine sprocket.


You can get the 18t engine sprocket here, see details re engine casing !

http://www.trialsbit...products_id=689

Incidentally I use 15 / 62 with 428 chain on the B40, some clever person will be able to work out if its the same as 13 / 72. But has the advantage of a slightly smaller rear sprocket for clearance.

Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

#15 big_red_bike

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Posted 09 October 2011 - 08:24 PM

You can get the 18t engine sprocket here, see details re engine casing !

http://www.trialsbit...products_id=689

Incidentally I use 15 / 62 with 428 chain on the B40, some clever person will be able to work out if its the same as 13 / 72. But has the advantage of a slightly smaller rear sprocket for clearance.

Ross

hi 15/62 is alot higher geared than 13/72




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