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Kyler
14th March 2016, 00:34
I have a GS1100 powered sidecar (ported heads, BS36 carbs, 1150 crank and pistons - no other power mods). The clutch slips briefly when I shift at high RPM (around 9K). I assume you guys have solved all the problems with these motors so what do I need to do? Add a lockup clutch?

Grumph
14th March 2016, 05:31
EBC do a heavy duty spring set. Limp wristed road riders use 3 of the 6 springs but manly sidecar racers use all 6......

Their fiber plate sets are very good too.

sidecar bob
14th March 2016, 06:27
I use the premier brand heavy duty fibre & spring set in a 1229 pre 82 solo, I also put an extra steel in too. Never have any issues.

Kyler
14th March 2016, 06:49
cool. This sounds like a cheap solution which I like.

sidecar bob
14th March 2016, 17:03
Soak the new fibres in engine oil for a few hours, & if the steels have seen a heap of slippage get new ones as they often go cone shaped from the heat.

Kyler
14th March 2016, 23:26
Soak the new fibres in engine oil for a few hours, & if the steels have seen a heap of slippage get new ones as they often go cone shaped from the heat.

will do! I didn't replace the steel plates so that may be my problem. They "seemed" flat.

Kickaha
15th March 2016, 05:51
They "seemed" flat.
If they are then we normally bead blast them in the bikes

Drew
15th March 2016, 06:47
Was a bit of a mission to assemble a full set of steels on our chair, out of three used packs.

Chairs are insanely hard on clutches. Be sure to warm them up on the warm up lap. Nothing aggressive, but slip it a bit to get the middle of the pack up to temp. Race starts carrying three times the weight it was designed to handle, it's no surprise they fuck out a lot.

Grumph
15th March 2016, 09:59
[QUOTE=Drew;1130955588

Chairs are insanely hard on clutches. Be sure to warm them up on the warm up lap. Nothing aggressive, but slip it a bit to get the middle of the pack up to temp. Race starts carrying three times the weight it was designed to handle, it's no surprise they fuck out a lot.[/QUOTE]

They're a lot like racecar clutches of the past - when i had a drive of the odd single seater I was always told to drop it so you broke traction. Much kinder on the friction surfaces than slipping it.
But as Ken will know, this then puts the pressure on the clutch backplate shock absorber...Which on the big jap fours of the period are a known weakness.
At least with the GS/GSX1100, heavy duty clutch baskets with much stronger backplates are available if he has to go that way.

Grumph
15th March 2016, 10:00
If they are then we normally bead blast them in the bikes

I hope you meant "out of the bike".......

sidecar bob
15th March 2016, 10:38
I hope you meant "out of the bike".......

No, that fuckin idiot would do them in the bike.;)