SOHC

Has anyone come across intercoms that are not bluetooth and work like the old ones?

When you put on the brakes it takes the friction off the wheelbearings and you speed up 

28 minutes ago, GregT said:

Ouch...that suggests to me it's seized there previously (hot spot under exhaust port) and been hand sanded clean. Over vigorously.

It had never been apart, has shows no signs of nipping up at all just when what ever happened to the ring peg happed it caused the ring to work like a scraper on the exhaust port

8 hours ago, h4nd said:

Nah. send it. it'll be fiiiine. Piston will polish that smoothish.

What's the angle on the chamfer on the lip of the port tho? Looks a bit brisk?

They re did it for free, it was 3 thou deep, thing would be worn out before it polished smooth.

I had to clean up the chamfer job 

On 17/01/2024 at 20:12, GregT said:

Well. colour me slightly surprised. Waiting for the AJS barrel spacer to appear from Autobend's laser cutter I thought I'd have a look at the crank balance factor. I decided I want to at least start with 60% balance factor. So it was set the crank up on new bearings in the cases upside down with the whole thing sitting on the four barrel studs and the rod hanging down free. I'd already pulled out the digital scales and got the figure of 86g for the rod small end. The piston, rings, pin and clips plus needle rollers came to 312g Total reciprocating weight 398g  60% of this 238.85g  Less the small end gave 152.8g as my checking weight.                                                                                                                                                                                                 When i put weights onto the free hanging rod to find out the amount that would balance it as it stood, I came up with 142g at which it would stop and stay anywhere it was placed.  So it is already counterbalanced very close to my desired figure of 152.8g  Call it 10g to come off the light side of the crank to get to 60%    This will be done by drilling a 3.3mm dia hole in the small exterior flywheel I had Anton machine up. Through the 12mm wide rim that should be 10g

Now, the surprise is because it has a longer rod, a bigger OD crankpin - hollow - probably a lighter bigend needle roller and a forged piston vs OE cast. I really didn't expect it to be anywhere near this close.  And believe me, i've checked my figures carefully. Standard must have been around 66%.

I know someone who has depleted uranium bar for making counter weights, its heavier than tungsten 

 TF125 seat, someone has trimmed the foam. free if anyone wants to come and get it?

Someone was saying on OS you will only be 80% happy if you pay for a jobe to be done in nz, 

6 hours ago, GregT said:

Better than a case I know of here. Barrel - CR250 - and piston - .020 over - handed to reconditioner.

Handed back bored 2mm over - with no explanation. Finished up in small claims court costing reconditioner a new barrel.

Haha fuck that bad.

I dont know what to say in my situation, i handed them a cylinder and piston and they did the job but i with they had stopped and told me

21 minutes ago, cletus said:

I had fork seals done by honda about a year ago

The same fork still leaks about the same amount as before, they did the inner fork seals but didn't do the outer wiper seal which was perished/ cracked so had to take it back for that at the time, then I painted the forks and re fitted them 

I asked them to do bushes if it needed them but they said it didn't 

There doesn't appear to be any play and the chrome looks ok from what I can see on the outside 

 

 

Is fork seals something that is difficult or problematic usually? 

05 honda cb900f /hornet  

I have found where the fork seal presses in can get distorted from a crash, measure the od and see if its round,  if its not you can hammer it back to shape with out taking anything apart, this works especially well on Sportsters 

11 minutes ago, GregT said:

Is the next oversize available ?

Yes it goes up in 0.5mm sizes, it didn't clean up at 0.5 so I will go to a 1mm.

I just think its a bit shit they didnt ring and say its not cleaning up

I had this cylinder bored by Taylor automotive in town, i wish they had told me it didn't clean up and not just finished it and give it back, this bad patch will trash the piston

Dose anyone want to swap this for a stock expansion chamber? I have pulled the bike apart and dont want to use this 

22 hours ago, tortron said:

The tank width difference is fairly minimal. I guess you have long knees tho, it's mostly at the front

 

Do you want to part with one of those tanks?

Whats the length of the RM seat from the bottom front edge to the rear?

11 minutes ago, tortron said:

I have like 6 bare frames if that helps! 

I wanted a plastic tank but would consider the 86 steel tank, I wouldn't mind a TS185 steel tank or a 1980 plastic RM tank to, its for the TF, I want a narrow tank and to get the seat fward slightly and a longer narrow seat

@tortron you would happen to have a 1986 DR200 fuel tank and seat would you?

I traded something for this, has a broken piston ring land but its in good condition, I use to have a TF and it was really good for going slow on on the bush on my tracks where you would instantly be killed on an mx bike

This didn't end well, things were turning to shit 

This thing has some strange harmonics, fuel tap turned it self off and then fell off as with the dipstick and clutch adjustment

Oh the twin, they make a horrible noise with open pipes, most nasty annoying sound, starter clutches were allways stuck and oil leaks from the bottom of the cylinders flange. I had to flat tow start one to a party for one of the burnout bikes but it wouldn't go so we dragged it on its side up the road and burnt it in the driveway, 2nd one we were trying to tow start but the rider didn't inform me he couldn't even ride a bicycle.

I had a GSX400 Impulse, those engines take an amazing about of punishment

They were about 80 pounds, at about 4000 rpm it was valve bouncing, i put the outer springs from that old Norton speedway engine I got on trademe in witch are alot stronger, the bike also has a speedway head.