JIS Screw Damage on Restrictor - Throttle Body

[kawakid]

No 2 son has just moved from A2 to full power.

His bike is a Honda 650R which was new in Autumn, the dealership had fitted an A2 restrictor for him. (The dealer is more than 1 hour away).

My son has taken the tank etc and gotten to where the restrictor is.

Its in a really fiddly location and he has said no screwbit will go in to it.

On closer inspection, it looks to me like the dealer has somehow bodged it and not used a JIS bit or used too much force.

I've ordered a JIS set as we don't have any.

But I'm reluctant that they will fit, if you look at the picture.

I'm not quite sure how to attack this, the air intake next to it and tight angle also makes me weary about using a dremmel.

I know the obvious thing is to get the bike back together and get it to either the dealer who did this or someone with more knowledge than a computer programmer (moi).

Any advice appreciated.

Ohh Merry Christmas.
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I've a twin and a 4.

[Pete.]

I would tap in a screwdriver bit but if you're short on mechanical sympathy then you might break the casting it's mounted to. Why does the bracket need to come off? Can you not just remove the cables from the bracket and re-fit them later?
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[stinkwheel]

Yes they are JIS, the screwdriver you get in the bikes toolkit is a JIS.

Yes, they look fairly chewed but a proper JIS bit usually gets a decent hold.

I agree with Pete., you almost certainly don't need to remove that bracket. If you back off the cable adjusters, you should be able to unhook the end of the cable from it. I've never had to remove that bracket on any of my bikes when fitting/removing a push-pull throttle cable.

Ordering a set of JIS screwdrivers if you own a Japanese bike is a good idea anyway. Here's why.
https://www.bikechatforums.com/files/jis.jpeg
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Kawasaki Jimbo]

I think the bracket is OE and a plate has been inserted under the screws with an arm which extends to the right and limits throttle movement. Hard to see if you’re viewing by phone. I think it’s that plate which has to come out, although I doubt that’s the only restriction.

These guys use the same image for all their kits but I reckon you’ve got the equivalent of the item at top middle. I could be wrong. https://a2restrictors.com/products/honda-cbr-650r-2025-a2-restrictor-kit-cbr650-cbr650r-650-r-018?_pos=7&_sid=dad606524&_ss=r

It’s surprising how many cross-head types there are. Since they’re already mashed (perhaps deliberately since derestriction isn’t supposed to be easy) I’d start with;

trying whatever cross-heads you already have in your tool box
see if a flat-head can get any grip
if the screw heads are soft I’ve had success with pliers
use a Dremel to notch the edge of the screw and then drive that anti-clockwise with chisel taps to turn it
cut a groove across the face and try a flat-head screwdriver again
an impact driver might do it if the bracket and what it’s screwed to can take it.

Start with the intent to use minimal force and maintain as much of the existing metal as possible, then gradually ramp up.

[Raffles]

Is 'JIS' still a thing on modern Japanese bikes?
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A good loser will always be a loser.

[stinkwheel]

Both of the screws in the picture are JIS. They both have a dot on the head.

JIS screwdrivers fit both JIS and Phillips. In fact, they work on Phillips better than a Phillips does because they don't torque out as easily.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[kawakid]