3TJ RESTRICTED

[sportspromatt]

The wee rrsp Ive bought, its a 95 import, it was running of cylinder 1 not all the time, on idle,
I cleaned and swapped it with cyl 2. It is back on all four, Took it for a wee spin. the top end seems restricted, would a restrictor, be fitted, or is it the exup valve. need to see if the servo moves as the revs incease.

Anything else to look out for, was going to service it midweek, if I get the chance.
plugs, oil, filter.

The wee bike is silky smooth, it just doesnt pull or rev maybe above, 9k revs.]

Cheers Matt

Post some phoos up later

[Evilchicken0]

Clean the carbs and do the fuel filters etc .... but you'll do that in the service this week anyway.

The exup is wide open by 8000 revs anyway so it could be it's sticking shut. Yoo can check the cables aren't frayed and have no slack with finger tightness. The engine uses idle jets below 6-8000 so you might have some of the main jets a bit blocked

As it's only one cylinder I'd look at the HT leads and plug caps (change the plugs too).

[sportspromatt]

Cheers Evil:

It seems to run ok, and rev when stationary, I had a fzr rr before the other sp, it wasnt restricted, and the sp I have a the minute does 130+ mph as well

This new one, is in kph, and something tells me its more a restriction problem, it seems to loose power mid rev, in every gear,
(hard to keep an eye, when your watching out for tractor, walkers, horses, prams etc aswell.

where are the restrictors fitted?

I seen the honda restrictors are fitted between, inlet manifold, under carbs, between carbs and engine.

Is the CDI box restricted on these SP, or is it something behind the clocks, or is it the carbs.

Will have another look tonight to make sure the exup servo, is working when stationary. I have a spare cdi unit of a 3TJ (RR) from what I remember it was a import but was again 130+ mph, could i fit this, and will it overcome the problem.

Thanks Matt

[Evilchicken0]

Oh - you mean 33hp restrictors ...

They're drilled blanking washers that sit between the carbs and the engine ... which would follow the symptoms you described of being fairly flat through the rev range, the bike will probably top out about 100mph .... plenty fast enough for you

Take the carbs off and clean them ... properly

[sportspromatt]

so when ive the carbs off, can i remove them myself,

can i remove them myself and just fit the carb back, after cleaning

so it wont be restricted anywhere else?

what the hell are they doing restricting it? its not as if its over powered

It awkward driving it like that, and a bit unsafe, I like my acceletation.

if you needed the acceleration, and it wasnt their, Id probably end up jumping of it

[plodder]

I would also consider a coil fault. That was the problem with mine starting to struggle at high revs when I bought it.

Evil may not have the answer... it's only a suggestion like mine above. You need to eliminate each possible cause one at a time. Eventually you will find the right one. Maybe there are restriction washers in there and maybe there are not... only one way to find out and then there's another thing ticked off the list.

It's all down to compression, fuel & spark. If you've got them all and all are correct then it may be the speedo restrictor or the CDS restrictor. However, I thought that the SP did not have one?

A service and thourough carb clean on a bike that is new to anyone I would say is mandatory if there are any problems before going looking for less obvious things that are wrong.

[toosmooth]

A service and thorough carb clean on a bike that is new to anyone I would say is mandatory

I used to think that until I cleaned the carbs on my FZ750 and made the thing unusable for 3 years...

make sure you have the appropriate talent to engage in "cleaning" delicate instruments like carbs. turns out I may have unwittingly altered my float heights.

toosmooth!

[sportspromatt]

bit of investigating last last, it revs ok while stationary, the exup valve is working, visual inspection, (damn, its noisy down their)
and rotates, the same as other rrsp.

felt exhaust downpipe number 1, not a s warn as the others
took it for a spin, and IT REVS, throughout the gears, to the red line, no problem. (ruling out restriction)

Then the penny dropped, went off number 1 full time, back to garage, tank off, airbox, HT lead going to No.1 is suspect,

This would explain, the semi warm pipe, intermittent spark, not revving, revving, and the dead!

further inspection, where the HT lead, goes into the cap, it is loose, the cap has a wee chip out of the bottom of it.

and the plug, was wet.

so I need a plug cap, and was lookin at the manual, seems I can test the coil, HT lead for resistance.

I could take the coil of the other sp, for testing! (will do this maybe tonight, after painting, cutting grass etc etc)

Are the FZR600 coils the same!!

And as alway THANKS lads for your help

[Evilchicken0]

Yup 600 coils are the same.

But - try swapping No1 and No4 HT leads over - they fire at the same time top and bottom dead centre (it's called wasted spark). Then if No4 is cooler you know where the problem is.
Un screw the plug cap and cut back the HT lead about 10mm them rescrew the cap on - if it's till the same then get a new cap.

You could fit Dyna coils ... which are nice

[plodder]

A service and thorough carb clean on a bike that is new to anyone I would say is mandatory

I used to think that until I cleaned the carbs on my FZ750 and made the thing unusable for 3 years...

make sure you have the appropriate talent to engage in "cleaning" delicate instruments like carbs. turns out I may have unwittingly altered my float heights.

toosmooth!

Finish the quote

...if there are any problems before going looking for less obvious things that are wrong

It's about getting certainty when you have a problem and ticking things off the list sytematically. I didn't say fiddle with it if it's not broke.

A clean bench, an air gun and patience are all that is required. Then you can check sizes of and clean all jets, check for daft needle positions and for damage to diaphragms.