Hi everyone, I've put my GSX1400 in my brothers garage out the way for a while so it's not in my way and doesn't get damaged while I start the resto on my gs750d. Does anyone know the engine compression for one of these as I don't have the manual for it yet, it's got
cyl 1 118 psi
cyl 2 100
cyl 3 110
cyl 4 120
Cylinder 2 is the one I'm worried about as it seems like it's about at the minimum psi from memory of these bikes, should I consider pulling the engine apart while it's out the frame and put new pistons and rings in. it's going off for vapour blasting and so if the head was off it could have the carbon removed by the vapour blasting, put new valve stem oil seals in and new valves /springs etc and do the full job. T.T.T
Beautiful bike! I just finished refreshing my best man's bike, 1979 gs850g after sitting in garage for last 12 years.
I'd say it all depends on how deep your pockets are & what you want at the end of the project.
their a great bike .. my 77 GS750
probably in better condition than I am.. :doh:
Excellent bikes. My 1000G rates as one of my best. Never did a thing wrong.
First model single disc, love the GS750. Many miles done a a GS850G.
Tony,
I wouldn't be worried about those figures UNLESS they were measured on a running engine and the valves were checked and in spec.
My experience with my GS1000G was a cylinder on a low mileage engine was showing 90psi on a cold compression test. Once the motor was running and valves adjusted it was all good. My bike had sat for 14 years when the cold test was conducted.
GS motors that are properly serviced (regular oil and filter changes, valve adjustments) shouldn't need attention under 250K kms.
Valve adjustments are simple but the most over looked maintenance.
I'm always amazed at the number of low mileage motors that are over hauled.
However their reliability often leads to neglect by some owners.
If you know the history of the bike that will help. I'd have it running and in spec before making any exspensive decisions.
Well as an update from when I started this resto I'm currently trying to motivate my self to get on with it haha, It's now 09.05.24 and the picture I've added is as far as I've got with it. All the powder coating is done and I bought another 1977 engine as I couldn't get the old one repaired after spending over £500.00 on it.
Tony.
P.S must try harder.
Hi Tony, i had a 1977 GS750d back in 1995 .I still have a Haynes manual but that does not give any reading numbers , just says put some oil in bores if bike been stood and then re do a comp test.But it could be your lucky day as i also have a CLYMER manual for GS750 fours 1977and according to that and it states that all cylinders should be between 128 and 170 psi. a max difference between 2 cylinders of 21psi is acceptable. Its a better book than Haynes in my opinion and gives performance tips and secrets from Yoshimura Rand D Department
I am open to offers if they any use to you ?
Quote from: dave55 on Tuesday, 14 May 2024, 11:19 PMHi Tony, i had a 1977 GS750d back in 1995 .I still have a Haynes manual but that does not give any reading numbers , just says put some oil in bores if bike been stood and then re do a comp test.But it could be your lucky day as i also have a CLYMER manual for GS750 fours 1977and according to that and it states that all cylinders should be between 128 and 170 psi. a max difference between 2 cylinders of 21psi is acceptable. Its a better book than Haynes in my opinion and gives performance tips and secrets from Yoshimura Rand D Department
I am open to offers if they any use to you ?
I have that very manual but thanks for the offer, I want to get started with it but at the minute I just don't have the motivation due to the pain I'm in while waiting for more spine surgery. Tony.
Hope the opp goes well. My mate has recently had back opp for 2nd time . new screws and rods along with fused sections. He was given all clear by surgeon to ride his bike again after 8 week !