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The 2-Stroke Garage => Turning Wrenches => Topic started by: AAAltered on January 04, 2023, 04:42:02 PM

Title: Repairing a bent frame tab
Post by: AAAltered on January 04, 2023, 04:42:02 PM
I rolled the RD200 back into the garage for winter repairs.

I had a tip over and the bike fell hard on the RR turn signal stalk.  Thankfully there was no body damage etc. 

Now I need to bend the turn signal mount back into shape to install a new stalk.

I need to remove the seat and fender to get a good grip on it.  I am planning to heat with a propane flame and attempt to bend back with a pair of vice grips.  It will cost me the frame paint (which can be touched up since it's fairly hidden) but I don't see other options. 

Opinions wanted.  Is propane hot enough to get some pliability on this?

Good side unbent tab:
(https://i.ibb.co/4WwRz9C/2-B1-BF8-D8-7-B80-4-F05-9899-E574584-FF182.jpg)

Bad side:
(https://i.ibb.co/9TMxqPB/564-C68-F4-CCC7-4777-9-C1-C-316542-A21227.jpg)

Replacement parts:
(https://i.ibb.co/3cs5WPc/D29-B142-A-1-B35-4-F3-F-A3-F2-4318-AA2781-EC.jpg)

Bad Side looking down:
(https://i.ibb.co/0BmxfgH/C200-FAA4-0-ADF-4952-816-E-834-CA7-EEFE06.jpg)

Mock up to show how much it's off:
(https://i.ibb.co/0BRYN80/9-A341-F56-9433-4-C74-B4-BD-99-CE537-BC6-A4.jpg)

Planning to grab with vice grips once the fender is removed:
(https://i.ibb.co/2sy3QJN/8-A210-AF0-EFDA-4-BF4-B8-E2-5-B96-C185-A7-AD.jpg)
Title: Re: Repairing a bent frame tab
Post by: bitzz on January 04, 2023, 04:56:08 PM
Take the light off the other side, and put a piece of threaded rod through both sides. Loch it in place with 4 nuts and washers to use as a "puller"
Put a small amount of tension on the bent side, rap it with a hammer on the bend, rinse and repeat, till the rod is level
Title: Re: Repairing a bent frame tab
Post by: Striker1423 on January 04, 2023, 08:09:23 PM
I like bitzz's approach. Heat works sure, but you'll discolor the frame there. Also, the metal is fairly pliable as-is. I'd just tweak it back with a cloth-wrapped channel lock, or vise grip. But... bitzz has a really good idea.
Title: Re: Repairing a bent frame tab
Post by: dgorms on January 04, 2023, 09:04:13 PM
I would start with finesse and finish with a BFH.
Title: Re: Repairing a bent frame tab
Post by: sav0r (CL MotoTech) on January 05, 2023, 02:50:30 AM
I'd use a large crescent wrench. No heat. Just bend it back. It's steel.
Title: Re: Repairing a bent frame tab
Post by: AAAltered on January 05, 2023, 09:17:38 AM
Thanks for the replies, great suggestions.  I'm probably getting garage time today to start tearing down.

I'll report back...
Title: Re: Repairing a bent frame tab
Post by: m in sc on January 05, 2023, 10:19:08 AM
this:

"I'd use a large crescent wrench. No heat. Just bend it back. It's steel."

just go slow. it'll be fine. if the return on the front is creased, make sure to use a brass drift and punch it back 'flat' as you bend to keep it from tearing there. I'd skip the heat.
Title: Re: Repairing a bent frame tab
Post by: Milan on January 05, 2023, 01:41:18 PM
I usually try and clamp 2 pieces of wood to it with a long sturdy ratchet clamp.
contour wood if needed to fit snug

1 on each side for protection, can even put a cloth in there.  Use the handle on the long clamp to then bend back Slooowly.

Hair dryer heat could help as well, and wont ruin paint.

M
Title: Re: Repairing a bent frame tab
Post by: AAAltered on January 06, 2023, 09:58:46 AM
Mission accomplished.

Using a big adjustable, wood drifts, mallet, and a big C clamp got me 'close enough'. 

Unfortunately the face of the signal mount was just too distorted to get back to flush and straight, but I was able to compensate with a small spacer after I got it as close as I could.

The fender was also damaged by the tail light assembly in the tip over, so the whole light and plate looked visibly tweaked.

I also discovered the worm in my Chinese Freight C clamp was pretty much made of cheese, flexing and bending under big pressure.

In any case, I am satisfied with the results.

Frame repair:
(https://i.ibb.co/rtT8th3/A6-DF565-B-BD04-4-CE0-A4-DD-3-C49-B1150-A1-F.jpg)

(https://i.ibb.co/N2PcGHr/A645-D3-BF-49-C7-45-C3-823-A-CFAA33-A6579-D.jpg)

(https://i.ibb.co/jRxxb6Z/DAC3-CDBA-F5-EF-4-FA7-A8-D9-14514-A804-A34.jpg)

Could not get the face smooth, see the visible light, but it's good enough:

(https://i.ibb.co/vZR7JsX/1-B83-ED70-ACDD-48-D2-826-C-A382496674-DA.jpg)

Fender repaired, and just for Dennis I smashed my thumb to a bloody pulp with the mallet:
(https://i.ibb.co/rkF6Gwk/B05757-A9-D5-FB-422-F-9-C44-B90091-C2-C805.jpg)

(https://i.ibb.co/P5kZhwM/319-F58-E3-8072-4-EF7-9-CE2-07-D64-EA9-F8-DB.jpg)

(https://i.ibb.co/kGb7nmM/ED7-E2-A22-ADA2-4995-9-ABF-297-EDFDB02-A7.jpg)

Bonus:  cleaned up the pot metal signals with spray cleaner and 0000 steel wool, came out good:
(https://i.ibb.co/921FQfY/2-FA32810-2-B7-F-48-FA-A66-B-CA4-E805-B69-D1.jpg)

(https://i.ibb.co/qxpMQJ2/891-CD0-CC-F412-4-C3-C-8-A1-D-70-E08897-DCFD.jpg)

Final reassembly:
(https://i.ibb.co/1LJSr2Z/A07-E293-A-C415-4-DCB-AA06-AC62166-B8-C31.jpg)

(https://i.ibb.co/s10D1NK/CEC81-F5-F-BA0-A-49-B8-B367-930154724158.jpg)
Title: Re: Repairing a bent frame tab
Post by: dgorms on January 06, 2023, 07:24:20 PM
Looks good! Sorry bout the thumb.......................D